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Electroplating
Electrochemistry Encyclopedia
(http://electrochem.cwru.edu/ed/encycl/)
ELECTROPLATING
Mordechay Schlesinger
Department of Physics
University of Windsor
Windsor, ON N9B 3P4, Canada
(September, 2002)
Electroplating has, over recent decades, evolved from an art to an exact science. This development is seen as responsible for the ever-increasing number and widening types of applications of this branch of practical science and engineering. Some of the technological areas in which means and methods of electroplating constitute an essential component are all aspects of electronics: macro and micro, optics, opto-electronics, and sensors of most types, to name only a few. In addition a number of key industries such as the automobile industry (that uses for example chrome plating to enhance the corrosion resistance of metal parts) adopt the methods even where other methods, such as evaporation, sputtering, chemical vapor deposition (CVD) and the like are an option. That is so for reasons of economy and convenience. By way of illustration it should be noted that that modern electroplating equips the practitioner with the ability to predesign the properties of surfaces and in the case of electroforming those of the whole part. Furthermore, the ability to deposit very thin multilayers (less than a millionth of a cm) via electroplating represents yet a new avenue of producing new materials.
Plating cell
Fig. 1. Schematics of an electrolytic cell for plating metal "M" from a solution of the metal salt "MA".
Electroplating is often also called "electrodeposition", and the two terms are used interchangeably. As a matter of fact, "electroplating" can be considered to occur by the process of electrodeposition. Electrodeposition is the process of producing a coating, usually metallic, on a surface by the action of electric current. The deposition of a metallic coating onto an object is achieved by putting a negative charge on the object to be coated and immersing it into a solution which contains a salt of the metal to be deposited (in other words, the object to be plated is made the cathode of an electrolytic cell). The metallic ions of the salt carry a positive charge and are thus attracted to the object. When they reach the negatively charged object (that is to be electroplated), it provides electrons to reduce the positively charged ions to metallic form. Figure 1 is a schematic presentation of an electrolytic cell for electroplating a metal "M" from an aqueous (water) solution of metal salt "MA".
To further illustrate the foregoing, let us assume that one has an object made of one of the common metals, like copper, and that it has been properly pre-cleaned. We should want to plate it with, say, nickel. A wire will have to be attached to the object while the other end of the wire should be attached to the negative pole of a battery (or a power supply). To the positive pole of the battery (or power supply) we connect another wire with its other end connected to a rod made of nickel. Next we fill the cell with a solution of the metal salt to be plated. It is possible to use a molten salt and in some not so common cases, such as the deposition of tungsten, that is what is done. In most, more common, cases though the salt is simply dissolved in water. In our present example the nickel chloride salt dissociates in water to positively charged nickel cations and negatively charged chloride anions. As the object to be plated is negatively charged it attracts the positively charged nickel cations, and electrons flow from the object to the cations to neutralize them (to reduce them) to metallic form. Meanwhile the negatively charged chloride anions are attracted to the positively charged nickel rod (known as the anode of the electrolytic cell). At the anode electrons are removed from the nickel metal, oxidizing it to the nickel cations. Thus we see that the nickel dissolves as ions into the solution. That is how replacement nickel is supplied to the solution for that which has been plated out and one retains a solution of nickel chloride in the cell.
Nickel chloride is used here to exemplify the process of electroplating for a number of reasons. First among those is simplicity. It is not recommended, however, that nickel be used for, say, school science demonstrations because some individuals are quite allergic to it. We further do not recommend that chloride salts be used because those are amenable to release chlorine gas. For school or amateur type demonstration we recommend plating copper coins with zinc or nickel coins with copper.
History
Before continuing with more detailed discussion of the subject at hand, a brief history of electroplating will be presented. The early history of electroplating may be traced back to around 1800. A university professor, or in modern terms: a chemist, Luigi Brugnatelli is considered as the first person to apply electrodeposition process to electroplate gold. Brugnatelli was a friend of Allisandro Volta (after whom the electric unit "volt" has been named) who had just a short time before discovered the chemical principles that would make possible the development of "voltaic" electrical cells. Volta's first actual demonstration of that was called "Voltaic Pile". As a consequence of this development, Brugnatelli's early work using voltaic electricity enabled him to experiment with various plating solutions. By 1805 he had refined his process enough to plate a fine layer of gold over large silver metal objects. He wrote in a letter to the Belgian Journal of Physics and Chemistry (later reprinted in Britain), which reads:
"I have lately gilt in a complete manner two large silver medals, by bringing them into communication by means of a steel wire, with a negative pole of a voltaic pile, and keeping them one after the other immersed in ammoniuret of gold newly made and well saturated".
Unfortunately for Brugnatelli, a disagreement or falling out with the French Academy of Sciences, the leading scientific body of Europe at the time, prevented Brugnatelli's work from being published in the scientific journals of his day. His work remained largely unknown outside of his native Italy except for a small group of associates. By 1839, however, scientist in Britain as well as in Russia had independently devised metal deposition processes similar to those of Brugnatelli's for copper electroplating of printing press plates. By 1840, this discovery was adapted and refined by Henry and George Elkington of Birmingham, England for gold and silver plating. Collaborating with their partner John Wright and using formulae developed by the latter for potassium cyanide plating baths, the Elkingtons were able to have the first viable patents for gold and silver electroplating issued on their name. From Great Britain the electroplating process for gold and silver quickly spread throughout the rest of Europe and later to the United States.
With the burgeoning knowledge and understanding of the subject of electrochemistry and its importance in understanding the processes of "electrodeposition" came the ability to deposit other metals. By the 1850's electroplating methods of bright nickel, brass, tin, and zinc were commercialized and were applied for engineering and specific commercial purposes. In time, the industrial age and financial capital had expanded from Great Britain to the rest of the world. As a result, electrodeposition processes were expanding in scope and found more and more usage in the production of a variety of goods and services. While this expansion was taking place, no significant scientific discoveries were made until the emergence of the electronic industry in the mid forties of the last century. The only exception to this were improvements made to direct current power supplies which were/are used instead of batteries. Thus it is said that the years from 1870 to 1940 were a quiet period as far as electroplating was concerned, significant only in gradual improvement in larger scale manufacturing processes, anodic and cathodic reaction principles and plating bath formulae. During the later years of the forties, rediscovery of heavy gold plating for electronic components took place. In comparison to that, during the mid to later fifties the usage of new and more "user friendly" plating baths based on acid formulae (rather than strongly poisonous cyanide based ones) were developed and introduced for large scale commercial use. In closing this brief historic summary one is to note that today a number of regulatory laws (enacted mainly in the nineteen-seventies), for instance concerning waste water emission and waste disposal, set the tone/direction for the electrodeposition/electroplating industry for the next thirty years.
Today, with the impressive progress and deeper understanding of the underlying electrochemical principles of electrodeposition, sophisticated plating baths formulae have been developed and are being routinely employed. Those provide much greater control over the working characteristics of the deposition process than hitherto. Layer thickness, performance of electroplated finishes is among the attributes that have been brought under strict control. New developments enable greater plating speed, better throwing power (the ability of a plating solution to produce a relatively uniform distribution of metal upon a cathode of irregular shape), as well as reliable plated finishes. In addition, electroplating of materials such as platinum, osmium, and ruthenium are now broadly used in electronics for connectors, circuit boards, contacts etc. The writer believes that new and innovative electroplating technology will facilitate the rapid expansion of the telecommunication industry. In general, the growth of the electronics industry as a whole, and the demand to support the expansion of its underlying infrastructure will continue to drive improvements worldwide in the electrodeposition/electroplating industry. To illustrate the possible directions of progress we mention the need for further refinement and control of dc power supplies. Such progress should lead to further achievements in the electroplating and metal finishing industry. Last, but certainly not least, safer manufacturing methods and processes including wastewater recycling should reduce work place exposure to dangerous chemicals and waste byproducts.
There has been a recent upsurge of interest in electrodeposition. This is due to three main factors/technologies:
* Metal deposition for the fabrication of integrated circuits.
* Deposition of magnetic recording devices (heads, discs).
* Deposition of multilayer structures.
By way of illustration we mention here that electrodeposition of copper for integrated circuit fabrication has been successfully used since 1997 for the production of interconnection lines down to less than 0.02 microns (micron = one millionth of a meter) width. Electrodeposition methods represent a very attractive alternative to the hitherto conventional fabrication methods.
Surface preparation
It is commonly accepted and often quoted by electroplaters that one can make a poor coating perform with excellent pretreatment, but one cannot make an excellent coating perform with poor pretreatment. Surface pretreatment by chemical and/or mechanical means is important not only in the case of preparations for electroplating but is also required in preparation for painting. In either of these, methods are designed to ensure good adhesion of the coating or paint to the surface. Most (metal) surface treatment and plating operations have three basic steps.
* Surface cleaning or preparation. Usually this includes employing of solvents, alkaline cleaners, acid cleaners, abrasive materials and/or water.
* Surface modification. That includes change in surface attributes, such as application of (metal) layer(s) and/or hardening.
* Rinsing or other work-piece finishing operations to produce/obtain the final product.
Surface cleaning or preparation will be discussed in more detail. Success of electroplating or surface conversion depends on removing contaminants and films from the substrate. Organic and nonmetallic films interfere with bonding by causing poor adhesion and even preventing deposition. The surface contamination can be extrinsic, comprised of organic debris and mineral dust from the environment or preceding processes. It can also be intrinsic, one example being a native oxide layer. Cleaning methods are designed to minimize substrate damage while removing the film or debris. If a (metal) surface's chemistry and processing history are known one can anticipate cleaning needs and methods. In practice, extrinsic organic and inorganic soils originate with processing of the substrate before plating, as well as from the environment. Specific residues include lubricants, phosphate coating, quenching oils, rust proofing oils, drawing compounds, and stamping lubricants. In short, the mixture of potential contaminants to which a part is exposed is typically complex. Again in case of a metal substrate it must be remembered that all metals form oxide and inorganic films to a degree with environmental gases and chemicals. Some of these are protective against continuing attack such as the aluminum oxide formed on aluminum alloys (see also anodizing). That phenomenon is the reason of the usefulness of aluminum siding on some homes. On the other hand, some are nonprotective, such as iron oxide on steel. Some of these films can even be plated directly with nickel over aluminum oxide over aluminum being an example. The cleaning and activation steps must account for the fact that surface oxide re-forms at different rates on different metals. Specifically, in case of iron or nickel the oxide re-forms slowly enough that the part can be transferred from a cleaning solution to a plating bath at a normal rate. In case of aluminum or magnesium the oxide re-forms very fast such that special processing steps are required to preserve the metal surface while it is being transferred to electroplating. Cleaning processes are based on two approaches. In physical cleaning, mechanical energy is introduced to release both extrinsic and intrinsic contaminants from the (metal) surface. Examples are ultrasonic agitation and brush abrasion. In chemical cleaning contaminant films are removed by active materials, dissolved or emulsified in the cleaning solution. Extrinsic contaminants are removed with surface-active chemicals while the chemical energies involved are modest. Intrinsic films are removed with aggressive chemicals that dissolve the contaminant and often react with the surface (metal) itself. The energy involved in surface preparation is substantial.
Deposition
By now it should be evident that electrodeposition or electroplating should be defined as the process in which the deposit of a (usually) thin layer (of metal) is formed "electrolyticly" upon a substrate (that is often, but not always, also a metal). The purpose of such process may be to enhance or change the substrate's appearance and/or attributes (such as corrosion resistance). Examples are the deposition of gold or silver on jewelry and utensils, and the deposition of chrome on automobile parts. Electroplating is performed in a liquid solution called an electrolyte, otherwise referred to as the "plating bath". The bath is a specially designed chemical solution that contains the desired metal (such as gold, copper, or nickel) dissolved in a form of submicroscopic metallic particles (positively charged ions). In addition, various substances (additives) are introduced in the bath to obtain smooth and bright deposits. The object that is to be plated is submerged into the electrolyte (plating bath). Placed usually at the center of the bath, the object that is to be plated acts as a negatively charged cathode. The positively charged anode(s) completes the electric circuit; those may be at opposite edges of the plating tank, thus causing film deposit on both sides of the cathode. A power source in the form of a battery or rectifier (which converts ac electricity to regulated low voltage dc current) is providing the necessary current. This type of circuit arrangement directs electrons (negative charge carriers) into a path from the power supply (rectifier) to the cathode (the object to be plated). Now, in the bath the electric current is carried largely by the positively charged ions from the anode(s) toward the negatively charged cathode. This movement makes the metal ions in the bath to migrate toward extra electrons that are located at or near the cathode's surface outer layer. Finally, by way of electrolysis the metal ions are removed from the solution and are deposited on the surface of the object as a thin layer. It is this process to which we refer as "electrodeposition". For a more technical discussion of some aspects of the process see the Appendix.
From the above it would appear that the thickness of the electroplated layer on the substrate is determined by the time duration of the plating. In other words, the longer time the object remains in the operating plating bath the thicker the resulting electroplated layer will be. Typically, layer thicknesses may vary from 0.1 to 30 microns (micron = one millionth of a meter), though nothing prevents the deposition of thicker or thinner layers, as desired. The geometric shape and contour of an object to be plated affects the thickness of the deposited layer. In general, objects with sharp corners and features will tend to have thicker deposits on the outside corners and thinner ones in the recessed areas. The cause of this difference in the resulting layer thicknesses is that dc current flows more densely to sharp edges than to the less accessible recessed areas, in other words, the current distribution is not uniform. (Another, more accurate, explanation of this phenomenon involves the geometry of the electric field lines that exist between cathode and anode in the solution). In practice, an item such as, say, a watch or similar item with sharp faceted corners are difficult (almost impossible, actually) to plate uniformly. A plating method known as "electroless plating", which is outside the scope of this article, assures uniformity of plated thickness even on highly irregular shaped objects. In the case of electroplating, judicial placement of the anode(s) as well as modifications of the current density are required to overcome the thickness irregularity effects. Electroplating processes will not, as a rule, conceal preexisting surface imperfections such as scratches, dents or pits. Actually, the plating process will more often than not, make most surface blemishes even more pronounced. Thus it is important to remove any undesirable surface marks prior to the plating action.
Voltammogram
Fig. 2. Typical voltammogram for a single-metal deposition (current and potential are plotted on arbitrary scales; cathodic current is negative by international convention, absolute value is plotted for sake of simplicity).
Now, the electrochemical process which occur in the deposition of a single metal has been known and utilized empirically for more than a century. In this case, it is not particularly necessary to examine the details of the mechanism and all the different (and numerous) parameters that would affect the process (and are outside the scope of this article).
However, when attempting to reduce two or more different metals from a single solution, it is essential that the processes occurring at the cathode be considered. The most effective tool for analyzing the processes is a voltammogram, a graph of current against electrode potential (Figure 2). Such a curve provides all the information necessary to select the appropriate potential for the reduction of a desired metal, individually, without the necessity of rigorously analyzing all the interactions involved. Thus, for instance, if one considered two metals "A" and "B" with metal "A" being less noble (that is, with a more negative standard potential) than "B", the voltammetric curve for either one would resemble that shown in Figure 2. For the purpose of selective deposition the important distinction between the two metals is the onset of the reduction peaks in the voltammograms and their separation. Specifically, if the two peaks are clearly separated, one can reduce only metal "B" at some potential, while both can be reduced at a more negative potential. At the more negative potential the ratio between the amount of each metal deposited, and so present in the alloy formed, is determined primarily by their relative concentrations in the solution. On the other hand, if the two voltammetric peaks overlap considerably, only an alloy can be deposited.
Another note of caution: one should not increase the cathodic potential (and current) too far to avoid parasitic reactions that may occur beyond "over-potential reactions" in Figure 2. In cases of practical applications be it electrorefining, electrowinning, or plating the practitioner is interested only in the weight of metal deposited on the cathode. Any current causing other changes is considered "wasted". Of course, according to Faraday's law the overall amount of chemical change produced by any given quantity of electricity can be exactly accounted for. Thus we define the current efficiency as the ratio between the actual amount of metal deposited to that expected theoretically from Faraday's law. In other words, the ratio of the weight of metal actually deposited to the weight that would have resulted if all the current had been used for depositing is called the cathode efficiency, and it is desirable to keep it as close to 100% as possible.
Superlattice plating
Fig. 3. Schematics of a plating setup for the production of superlattice multilayers.
The possibility of plating two metals from the same solution at different potentials, as discussed above, permits the creation of complex structures with relatively simple processes. Figure 3 depicts the schematics of a practical electrodeposition cell for the production of super-lattice multilayers. In this case, the deposition is carried out using a computer controlled potentiostat that controls the potential of the piece to be coated (the cathode) against the reference electrode. A pulse train shaped potential is enforced, resulting in the multilayer deposition. If one considers a copper/nickel system, the potential difference between the two levels would be approximately half a volt, with pure copper being deposited at the more positive potential and an alloy at the more negative potential. The thickness of the layers is controlled by the width of the pulses, very thin layers (less than a millionth of a cm) can be deposited in a few milliseconds (thousandth of a second) per layer. This way, multilayers of the two metals can be deposited using a single bath to produce magnetic/multilayer structures to be used in reading heads for computer hard discs. This example illustrates how complex and sophisticated the electrodeposition techniques may be.
Appendix
Electrodeposition or electrochemical deposition (of metals or alloys) involves the reduction of metal ions from aqueous, organic, or fused salt electrolytes. In it's simplest form the reaction in aqueous medium at the cathode follows the equation
[1] M+n + ne- ==> M
with a corresponding anodic reaction. The anode material can either be the metal to be deposited (in this case the electrode reaction is electrodissolution that continuously supplies the metal ions) or the anode can be an inert material and the anodic reaction is oxygen evolution (in this case the plating solution is eventually depleted of metal ions).
The deposition may, in principle, be accomplished via two different paths:
* An electrodeposition process in which electrons are provided by an external power supply.
* An electroless (autocatalytic) deposition process in which a reducing agent in solution is the electron source.
The deposition reaction presented in Equation [1] is a reaction of charged particles at the interface between a solid (metal) electrode and a liquid solution. The two types of charged particles that can cross the interface are metal ions "M+n" and electrons "e-".
The deposition reaction involves four types of issues. They are:
* Metal-solution interface as the locus of the deposition process.
* Kinetics and mechanism of the deposition process.
* Nucleation and growth process of the metal lattice (M lattice).
* Structure and properties of the deposits.
A detailed discussion of these issues is outside the scope of this article, and can be found in the books listed in the Bibliography.
The reduction of a metal, which occurs during the plating process, has been generalized as Equation [1] for a single metallic ion. Obviously, to reduce one mole of a given metal "n" moles of electrons are required. That is, the total cathodic charge used in the deposition "Q" (coulomb) is the product of the number of gram moles of the metal deposited "m", the number of electrons taking part in the reduction "n", Avogadro's number "Na" (the number of atoms in a mole), and the electrical charge per electron "Qe" (coulomb). Thus, the following equation gives the charge required to reduce "m" mole of metal:
[2] Q = m n Na Qe
Now, the product of the last two terms in this equation is the "Faraday constant" "F". Therefore, the number of moles of metal reduced by charge "Q" can be obtained as:
[3] m = Q / (n F)
On the other hand, the total charge used in the deposition can be obtained as the product of the current "I" (ampere) and the time of deposition "t" (second) if the deposition current is held constant. Or, if the current varies during the deposition:
[4]
So, the number of moles deposited can be calculated as:
[5]
The weight of the deposit "w" (gram) can now be obtained by multiplying Equation [5] with the atomic weight "Mw" of the deposited metal. Finally, to calculate the thickness of the deposit, we have to use the density of the metal "D" (gram/cm3):
[6] D = w / V = w / (A T)
where "V" is the volume of the deposited metal in cm3, "A" is the area of the deposit in cm2, and "T" is its thickness in cm. Solving for thickness, using Equations [5] and [6] we have the useful practical expression:
[7]
As mentioned above, if the current was held constant during the deposition, the integral in Equation [7], can be replaced by the simple product of current and time "I×t".
Related articles
Effect of magnetic fields on electroplating.
Extracting metals from sulfide ores
Metal powder production by electrolysis
Bibliography
* Modern Electroplating (4th edition), M. Schlesinger and M. Paunovic (editors), Wiley, New York, 2000.
* Fundamentals of Electrochemical Deposition, M. Paunovic and M. Schlesinger, Wiley, New York, 1998.
Listings of electrochemistry books, review chapters, and proceedings volumes are also available in the Electrochemistry Science and Technology Information Resource (ESTIR). (http://electrochem.cwru.edu/estir/)
(http://electrochem.cwru.edu/ed/encycl/)
ELECTROPLATING
Mordechay Schlesinger
Department of Physics
University of Windsor
Windsor, ON N9B 3P4, Canada
(September, 2002)
Electroplating has, over recent decades, evolved from an art to an exact science. This development is seen as responsible for the ever-increasing number and widening types of applications of this branch of practical science and engineering. Some of the technological areas in which means and methods of electroplating constitute an essential component are all aspects of electronics: macro and micro, optics, opto-electronics, and sensors of most types, to name only a few. In addition a number of key industries such as the automobile industry (that uses for example chrome plating to enhance the corrosion resistance of metal parts) adopt the methods even where other methods, such as evaporation, sputtering, chemical vapor deposition (CVD) and the like are an option. That is so for reasons of economy and convenience. By way of illustration it should be noted that that modern electroplating equips the practitioner with the ability to predesign the properties of surfaces and in the case of electroforming those of the whole part. Furthermore, the ability to deposit very thin multilayers (less than a millionth of a cm) via electroplating represents yet a new avenue of producing new materials.
Plating cell
Fig. 1. Schematics of an electrolytic cell for plating metal "M" from a solution of the metal salt "MA".
Electroplating is often also called "electrodeposition", and the two terms are used interchangeably. As a matter of fact, "electroplating" can be considered to occur by the process of electrodeposition. Electrodeposition is the process of producing a coating, usually metallic, on a surface by the action of electric current. The deposition of a metallic coating onto an object is achieved by putting a negative charge on the object to be coated and immersing it into a solution which contains a salt of the metal to be deposited (in other words, the object to be plated is made the cathode of an electrolytic cell). The metallic ions of the salt carry a positive charge and are thus attracted to the object. When they reach the negatively charged object (that is to be electroplated), it provides electrons to reduce the positively charged ions to metallic form. Figure 1 is a schematic presentation of an electrolytic cell for electroplating a metal "M" from an aqueous (water) solution of metal salt "MA".
To further illustrate the foregoing, let us assume that one has an object made of one of the common metals, like copper, and that it has been properly pre-cleaned. We should want to plate it with, say, nickel. A wire will have to be attached to the object while the other end of the wire should be attached to the negative pole of a battery (or a power supply). To the positive pole of the battery (or power supply) we connect another wire with its other end connected to a rod made of nickel. Next we fill the cell with a solution of the metal salt to be plated. It is possible to use a molten salt and in some not so common cases, such as the deposition of tungsten, that is what is done. In most, more common, cases though the salt is simply dissolved in water. In our present example the nickel chloride salt dissociates in water to positively charged nickel cations and negatively charged chloride anions. As the object to be plated is negatively charged it attracts the positively charged nickel cations, and electrons flow from the object to the cations to neutralize them (to reduce them) to metallic form. Meanwhile the negatively charged chloride anions are attracted to the positively charged nickel rod (known as the anode of the electrolytic cell). At the anode electrons are removed from the nickel metal, oxidizing it to the nickel cations. Thus we see that the nickel dissolves as ions into the solution. That is how replacement nickel is supplied to the solution for that which has been plated out and one retains a solution of nickel chloride in the cell.
Nickel chloride is used here to exemplify the process of electroplating for a number of reasons. First among those is simplicity. It is not recommended, however, that nickel be used for, say, school science demonstrations because some individuals are quite allergic to it. We further do not recommend that chloride salts be used because those are amenable to release chlorine gas. For school or amateur type demonstration we recommend plating copper coins with zinc or nickel coins with copper.
History
Before continuing with more detailed discussion of the subject at hand, a brief history of electroplating will be presented. The early history of electroplating may be traced back to around 1800. A university professor, or in modern terms: a chemist, Luigi Brugnatelli is considered as the first person to apply electrodeposition process to electroplate gold. Brugnatelli was a friend of Allisandro Volta (after whom the electric unit "volt" has been named) who had just a short time before discovered the chemical principles that would make possible the development of "voltaic" electrical cells. Volta's first actual demonstration of that was called "Voltaic Pile". As a consequence of this development, Brugnatelli's early work using voltaic electricity enabled him to experiment with various plating solutions. By 1805 he had refined his process enough to plate a fine layer of gold over large silver metal objects. He wrote in a letter to the Belgian Journal of Physics and Chemistry (later reprinted in Britain), which reads:
"I have lately gilt in a complete manner two large silver medals, by bringing them into communication by means of a steel wire, with a negative pole of a voltaic pile, and keeping them one after the other immersed in ammoniuret of gold newly made and well saturated".
Unfortunately for Brugnatelli, a disagreement or falling out with the French Academy of Sciences, the leading scientific body of Europe at the time, prevented Brugnatelli's work from being published in the scientific journals of his day. His work remained largely unknown outside of his native Italy except for a small group of associates. By 1839, however, scientist in Britain as well as in Russia had independently devised metal deposition processes similar to those of Brugnatelli's for copper electroplating of printing press plates. By 1840, this discovery was adapted and refined by Henry and George Elkington of Birmingham, England for gold and silver plating. Collaborating with their partner John Wright and using formulae developed by the latter for potassium cyanide plating baths, the Elkingtons were able to have the first viable patents for gold and silver electroplating issued on their name. From Great Britain the electroplating process for gold and silver quickly spread throughout the rest of Europe and later to the United States.
With the burgeoning knowledge and understanding of the subject of electrochemistry and its importance in understanding the processes of "electrodeposition" came the ability to deposit other metals. By the 1850's electroplating methods of bright nickel, brass, tin, and zinc were commercialized and were applied for engineering and specific commercial purposes. In time, the industrial age and financial capital had expanded from Great Britain to the rest of the world. As a result, electrodeposition processes were expanding in scope and found more and more usage in the production of a variety of goods and services. While this expansion was taking place, no significant scientific discoveries were made until the emergence of the electronic industry in the mid forties of the last century. The only exception to this were improvements made to direct current power supplies which were/are used instead of batteries. Thus it is said that the years from 1870 to 1940 were a quiet period as far as electroplating was concerned, significant only in gradual improvement in larger scale manufacturing processes, anodic and cathodic reaction principles and plating bath formulae. During the later years of the forties, rediscovery of heavy gold plating for electronic components took place. In comparison to that, during the mid to later fifties the usage of new and more "user friendly" plating baths based on acid formulae (rather than strongly poisonous cyanide based ones) were developed and introduced for large scale commercial use. In closing this brief historic summary one is to note that today a number of regulatory laws (enacted mainly in the nineteen-seventies), for instance concerning waste water emission and waste disposal, set the tone/direction for the electrodeposition/electroplating industry for the next thirty years.
Today, with the impressive progress and deeper understanding of the underlying electrochemical principles of electrodeposition, sophisticated plating baths formulae have been developed and are being routinely employed. Those provide much greater control over the working characteristics of the deposition process than hitherto. Layer thickness, performance of electroplated finishes is among the attributes that have been brought under strict control. New developments enable greater plating speed, better throwing power (the ability of a plating solution to produce a relatively uniform distribution of metal upon a cathode of irregular shape), as well as reliable plated finishes. In addition, electroplating of materials such as platinum, osmium, and ruthenium are now broadly used in electronics for connectors, circuit boards, contacts etc. The writer believes that new and innovative electroplating technology will facilitate the rapid expansion of the telecommunication industry. In general, the growth of the electronics industry as a whole, and the demand to support the expansion of its underlying infrastructure will continue to drive improvements worldwide in the electrodeposition/electroplating industry. To illustrate the possible directions of progress we mention the need for further refinement and control of dc power supplies. Such progress should lead to further achievements in the electroplating and metal finishing industry. Last, but certainly not least, safer manufacturing methods and processes including wastewater recycling should reduce work place exposure to dangerous chemicals and waste byproducts.
There has been a recent upsurge of interest in electrodeposition. This is due to three main factors/technologies:
* Metal deposition for the fabrication of integrated circuits.
* Deposition of magnetic recording devices (heads, discs).
* Deposition of multilayer structures.
By way of illustration we mention here that electrodeposition of copper for integrated circuit fabrication has been successfully used since 1997 for the production of interconnection lines down to less than 0.02 microns (micron = one millionth of a meter) width. Electrodeposition methods represent a very attractive alternative to the hitherto conventional fabrication methods.
Surface preparation
It is commonly accepted and often quoted by electroplaters that one can make a poor coating perform with excellent pretreatment, but one cannot make an excellent coating perform with poor pretreatment. Surface pretreatment by chemical and/or mechanical means is important not only in the case of preparations for electroplating but is also required in preparation for painting. In either of these, methods are designed to ensure good adhesion of the coating or paint to the surface. Most (metal) surface treatment and plating operations have three basic steps.
* Surface cleaning or preparation. Usually this includes employing of solvents, alkaline cleaners, acid cleaners, abrasive materials and/or water.
* Surface modification. That includes change in surface attributes, such as application of (metal) layer(s) and/or hardening.
* Rinsing or other work-piece finishing operations to produce/obtain the final product.
Surface cleaning or preparation will be discussed in more detail. Success of electroplating or surface conversion depends on removing contaminants and films from the substrate. Organic and nonmetallic films interfere with bonding by causing poor adhesion and even preventing deposition. The surface contamination can be extrinsic, comprised of organic debris and mineral dust from the environment or preceding processes. It can also be intrinsic, one example being a native oxide layer. Cleaning methods are designed to minimize substrate damage while removing the film or debris. If a (metal) surface's chemistry and processing history are known one can anticipate cleaning needs and methods. In practice, extrinsic organic and inorganic soils originate with processing of the substrate before plating, as well as from the environment. Specific residues include lubricants, phosphate coating, quenching oils, rust proofing oils, drawing compounds, and stamping lubricants. In short, the mixture of potential contaminants to which a part is exposed is typically complex. Again in case of a metal substrate it must be remembered that all metals form oxide and inorganic films to a degree with environmental gases and chemicals. Some of these are protective against continuing attack such as the aluminum oxide formed on aluminum alloys (see also anodizing). That phenomenon is the reason of the usefulness of aluminum siding on some homes. On the other hand, some are nonprotective, such as iron oxide on steel. Some of these films can even be plated directly with nickel over aluminum oxide over aluminum being an example. The cleaning and activation steps must account for the fact that surface oxide re-forms at different rates on different metals. Specifically, in case of iron or nickel the oxide re-forms slowly enough that the part can be transferred from a cleaning solution to a plating bath at a normal rate. In case of aluminum or magnesium the oxide re-forms very fast such that special processing steps are required to preserve the metal surface while it is being transferred to electroplating. Cleaning processes are based on two approaches. In physical cleaning, mechanical energy is introduced to release both extrinsic and intrinsic contaminants from the (metal) surface. Examples are ultrasonic agitation and brush abrasion. In chemical cleaning contaminant films are removed by active materials, dissolved or emulsified in the cleaning solution. Extrinsic contaminants are removed with surface-active chemicals while the chemical energies involved are modest. Intrinsic films are removed with aggressive chemicals that dissolve the contaminant and often react with the surface (metal) itself. The energy involved in surface preparation is substantial.
Deposition
By now it should be evident that electrodeposition or electroplating should be defined as the process in which the deposit of a (usually) thin layer (of metal) is formed "electrolyticly" upon a substrate (that is often, but not always, also a metal). The purpose of such process may be to enhance or change the substrate's appearance and/or attributes (such as corrosion resistance). Examples are the deposition of gold or silver on jewelry and utensils, and the deposition of chrome on automobile parts. Electroplating is performed in a liquid solution called an electrolyte, otherwise referred to as the "plating bath". The bath is a specially designed chemical solution that contains the desired metal (such as gold, copper, or nickel) dissolved in a form of submicroscopic metallic particles (positively charged ions). In addition, various substances (additives) are introduced in the bath to obtain smooth and bright deposits. The object that is to be plated is submerged into the electrolyte (plating bath). Placed usually at the center of the bath, the object that is to be plated acts as a negatively charged cathode. The positively charged anode(s) completes the electric circuit; those may be at opposite edges of the plating tank, thus causing film deposit on both sides of the cathode. A power source in the form of a battery or rectifier (which converts ac electricity to regulated low voltage dc current) is providing the necessary current. This type of circuit arrangement directs electrons (negative charge carriers) into a path from the power supply (rectifier) to the cathode (the object to be plated). Now, in the bath the electric current is carried largely by the positively charged ions from the anode(s) toward the negatively charged cathode. This movement makes the metal ions in the bath to migrate toward extra electrons that are located at or near the cathode's surface outer layer. Finally, by way of electrolysis the metal ions are removed from the solution and are deposited on the surface of the object as a thin layer. It is this process to which we refer as "electrodeposition". For a more technical discussion of some aspects of the process see the Appendix.
From the above it would appear that the thickness of the electroplated layer on the substrate is determined by the time duration of the plating. In other words, the longer time the object remains in the operating plating bath the thicker the resulting electroplated layer will be. Typically, layer thicknesses may vary from 0.1 to 30 microns (micron = one millionth of a meter), though nothing prevents the deposition of thicker or thinner layers, as desired. The geometric shape and contour of an object to be plated affects the thickness of the deposited layer. In general, objects with sharp corners and features will tend to have thicker deposits on the outside corners and thinner ones in the recessed areas. The cause of this difference in the resulting layer thicknesses is that dc current flows more densely to sharp edges than to the less accessible recessed areas, in other words, the current distribution is not uniform. (Another, more accurate, explanation of this phenomenon involves the geometry of the electric field lines that exist between cathode and anode in the solution). In practice, an item such as, say, a watch or similar item with sharp faceted corners are difficult (almost impossible, actually) to plate uniformly. A plating method known as "electroless plating", which is outside the scope of this article, assures uniformity of plated thickness even on highly irregular shaped objects. In the case of electroplating, judicial placement of the anode(s) as well as modifications of the current density are required to overcome the thickness irregularity effects. Electroplating processes will not, as a rule, conceal preexisting surface imperfections such as scratches, dents or pits. Actually, the plating process will more often than not, make most surface blemishes even more pronounced. Thus it is important to remove any undesirable surface marks prior to the plating action.
Voltammogram
Fig. 2. Typical voltammogram for a single-metal deposition (current and potential are plotted on arbitrary scales; cathodic current is negative by international convention, absolute value is plotted for sake of simplicity).
Now, the electrochemical process which occur in the deposition of a single metal has been known and utilized empirically for more than a century. In this case, it is not particularly necessary to examine the details of the mechanism and all the different (and numerous) parameters that would affect the process (and are outside the scope of this article).
However, when attempting to reduce two or more different metals from a single solution, it is essential that the processes occurring at the cathode be considered. The most effective tool for analyzing the processes is a voltammogram, a graph of current against electrode potential (Figure 2). Such a curve provides all the information necessary to select the appropriate potential for the reduction of a desired metal, individually, without the necessity of rigorously analyzing all the interactions involved. Thus, for instance, if one considered two metals "A" and "B" with metal "A" being less noble (that is, with a more negative standard potential) than "B", the voltammetric curve for either one would resemble that shown in Figure 2. For the purpose of selective deposition the important distinction between the two metals is the onset of the reduction peaks in the voltammograms and their separation. Specifically, if the two peaks are clearly separated, one can reduce only metal "B" at some potential, while both can be reduced at a more negative potential. At the more negative potential the ratio between the amount of each metal deposited, and so present in the alloy formed, is determined primarily by their relative concentrations in the solution. On the other hand, if the two voltammetric peaks overlap considerably, only an alloy can be deposited.
Another note of caution: one should not increase the cathodic potential (and current) too far to avoid parasitic reactions that may occur beyond "over-potential reactions" in Figure 2. In cases of practical applications be it electrorefining, electrowinning, or plating the practitioner is interested only in the weight of metal deposited on the cathode. Any current causing other changes is considered "wasted". Of course, according to Faraday's law the overall amount of chemical change produced by any given quantity of electricity can be exactly accounted for. Thus we define the current efficiency as the ratio between the actual amount of metal deposited to that expected theoretically from Faraday's law. In other words, the ratio of the weight of metal actually deposited to the weight that would have resulted if all the current had been used for depositing is called the cathode efficiency, and it is desirable to keep it as close to 100% as possible.
Superlattice plating
Fig. 3. Schematics of a plating setup for the production of superlattice multilayers.
The possibility of plating two metals from the same solution at different potentials, as discussed above, permits the creation of complex structures with relatively simple processes. Figure 3 depicts the schematics of a practical electrodeposition cell for the production of super-lattice multilayers. In this case, the deposition is carried out using a computer controlled potentiostat that controls the potential of the piece to be coated (the cathode) against the reference electrode. A pulse train shaped potential is enforced, resulting in the multilayer deposition. If one considers a copper/nickel system, the potential difference between the two levels would be approximately half a volt, with pure copper being deposited at the more positive potential and an alloy at the more negative potential. The thickness of the layers is controlled by the width of the pulses, very thin layers (less than a millionth of a cm) can be deposited in a few milliseconds (thousandth of a second) per layer. This way, multilayers of the two metals can be deposited using a single bath to produce magnetic/multilayer structures to be used in reading heads for computer hard discs. This example illustrates how complex and sophisticated the electrodeposition techniques may be.
Appendix
Electrodeposition or electrochemical deposition (of metals or alloys) involves the reduction of metal ions from aqueous, organic, or fused salt electrolytes. In it's simplest form the reaction in aqueous medium at the cathode follows the equation
[1] M+n + ne- ==> M
with a corresponding anodic reaction. The anode material can either be the metal to be deposited (in this case the electrode reaction is electrodissolution that continuously supplies the metal ions) or the anode can be an inert material and the anodic reaction is oxygen evolution (in this case the plating solution is eventually depleted of metal ions).
The deposition may, in principle, be accomplished via two different paths:
* An electrodeposition process in which electrons are provided by an external power supply.
* An electroless (autocatalytic) deposition process in which a reducing agent in solution is the electron source.
The deposition reaction presented in Equation [1] is a reaction of charged particles at the interface between a solid (metal) electrode and a liquid solution. The two types of charged particles that can cross the interface are metal ions "M+n" and electrons "e-".
The deposition reaction involves four types of issues. They are:
* Metal-solution interface as the locus of the deposition process.
* Kinetics and mechanism of the deposition process.
* Nucleation and growth process of the metal lattice (M lattice).
* Structure and properties of the deposits.
A detailed discussion of these issues is outside the scope of this article, and can be found in the books listed in the Bibliography.
The reduction of a metal, which occurs during the plating process, has been generalized as Equation [1] for a single metallic ion. Obviously, to reduce one mole of a given metal "n" moles of electrons are required. That is, the total cathodic charge used in the deposition "Q" (coulomb) is the product of the number of gram moles of the metal deposited "m", the number of electrons taking part in the reduction "n", Avogadro's number "Na" (the number of atoms in a mole), and the electrical charge per electron "Qe" (coulomb). Thus, the following equation gives the charge required to reduce "m" mole of metal:
[2] Q = m n Na Qe
Now, the product of the last two terms in this equation is the "Faraday constant" "F". Therefore, the number of moles of metal reduced by charge "Q" can be obtained as:
[3] m = Q / (n F)
On the other hand, the total charge used in the deposition can be obtained as the product of the current "I" (ampere) and the time of deposition "t" (second) if the deposition current is held constant. Or, if the current varies during the deposition:
[4]
So, the number of moles deposited can be calculated as:
[5]
The weight of the deposit "w" (gram) can now be obtained by multiplying Equation [5] with the atomic weight "Mw" of the deposited metal. Finally, to calculate the thickness of the deposit, we have to use the density of the metal "D" (gram/cm3):
[6] D = w / V = w / (A T)
where "V" is the volume of the deposited metal in cm3, "A" is the area of the deposit in cm2, and "T" is its thickness in cm. Solving for thickness, using Equations [5] and [6] we have the useful practical expression:
[7]
As mentioned above, if the current was held constant during the deposition, the integral in Equation [7], can be replaced by the simple product of current and time "I×t".
Related articles
Effect of magnetic fields on electroplating.
Extracting metals from sulfide ores
Metal powder production by electrolysis
Bibliography
* Modern Electroplating (4th edition), M. Schlesinger and M. Paunovic (editors), Wiley, New York, 2000.
* Fundamentals of Electrochemical Deposition, M. Paunovic and M. Schlesinger, Wiley, New York, 1998.
Listings of electrochemistry books, review chapters, and proceedings volumes are also available in the Electrochemistry Science and Technology Information Resource (ESTIR). (http://electrochem.cwru.edu/estir/)
Tuesday, July 31, 2007
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Derby Hotels
Accommodation Western Australia
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King Sound Resort Hotel Derby
Central Derby
From $69
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Esperance Hotels
Accommodation Western Australia
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The Doo Drop Inn Bed And Breakfast Esperance
Central Esperance
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Woody Island Overnight Camp Safari Tents Esperance
Central Esperance
From $26
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The Jetty Resort Motel Esperance
Central Esperance
From $35
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Crokers Park Holiday Resort Holiday Village Esperance
Central Esperance
From $38
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The Old Hospital Motel Esperance
Central Esperance
From $43
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Island View Apartments formerley Esperance Seaside Apartments Apartments Esperance
Central Esperance
From $45
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Esperance Beach House Apartments Esperance
Central Esperance
From $50
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All Seasons Esplanade Apartments Esperance
Central Esperance
From $53
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Best Western Hospitality Inn Esperance Hotel
Central Esperance
From $57
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Comfort Inn Bay Of Isles Motel Esperance
Central Esperance
From $60
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Exmouth Hotels
Accommodation Western Australia
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Novotel Ningaloo Resort Exmouth
Central Exmouth
From
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Exmouth Cape Holiday Park formerley Exmouth Cape Tourist Village Holiday Village Exmouth
Central Exmouth
From $24
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per person, per night, 1 share
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Ningaloo Lodge Guesthouse Exmouth
Central Exmouth
From $38
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Potshot Hotel Resort Hotel Exmouth
Central Exmouth
From $45
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Best Western Sea Breeze Resort Hotel Exmouth
Central Exmouth
From $56
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Fitzroy Crossing Hotels
Accommodation Western Australia
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Fitzroy River Lodge Hotel Fitzroy Crossing
Central Fitzroy Crossing
From $68
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per person, per night, 2 share
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Geraldton Hotels
Accommodation Western Australia
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All Seasons Geraldton Hotel
Central Geraldton
From $52
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per person, per night, 2 share
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Batavia Motor Inne Hotel Geraldton
Central Geraldton
From $53
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Best Western Hospitality Inn Geraldton Hotel
Central Geraldton
From $57
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African Reef Resort Hotel Geraldton
Central Geraldton
From $105
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per person, per night, 1 share
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Gibb River Road Area Hotels
Accommodation Western Australia
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Imintji Safari Camp Safari Tents Gibb River Road Area
Bell Gorge Gibb River Road Area
From
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Ungolan Safari Camp Safari Tents Gibb River Road Area
Mitchell Plateau Gibb River Road Area
From
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Marunbabidi Safari Camp Safari Tents Gibb River Road Area
King Edward River Gibb River Road Area
From
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El Questro Wilderness Park Hotel Gibb River Road Area
Central Gibb River Road Area
From
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Drysdale River Station Stationstay Gibb River Road Area
Drysdale River Gibb River Road Area
From
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Home Valley Homestead Stationstay Gibb River Road Area
Central Gibb River Road Area
From
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Charnley River Station Stationstay Gibb River Road Area
Gorges Gibb River Road Area
From $60
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Mt Elizabeth Station Stationstay Gibb River Road Area
Mt Elizabeth Gibb River Road Area
From $99
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per person, per night, 1 share
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Mornington Wilderness Camp Safari Tents Gibb River Road Area
Central Gibb River Road Area
From $190
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per person, per night, 2 share
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Greenhead Hotels
Accommodation Western Australia
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Maccas Mooring Bed And Breakfast Greenhead
Central Greenhead
From $60
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per person, per night, 2 share
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Halls Creek Hotels
Accommodation Western Australia
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Best Western Halls Creek Motel
Central Halls Creek
From $65
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per person, per night, 2 share
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Kimberley Hotel Halls Creek
Central Halls Creek
From $67
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Kalbarri Hotels
Accommodation Western Australia
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Kalbarri Murchison View Apartments Kalbarri
Central Kalbarri
From $17
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per person, per night, 6 share
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Kalbarri Seafront Villas Kalbarri
Central Kalbarri
From $38
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per person, per night, 4 share
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Best Western Kalbarri Palm Resort Hotel Kalbarri
Central Kalbarri
From $60
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per person, per night, 2 share
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Kalgoorlie Hotels
Accommodation Western Australia
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Palace Hotel Kalgoorlie
Central Kalgoorlie
From
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Kalgoorlie Overland Motel Hotel Kalgoorlie
Central Kalgoorlie
From $47
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Kalgoorlie Accommodation Village Holiday Village Kalgoorlie
Central Kalgoorlie
From $47
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per person, per night, 2 share
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Quest Yelverton Apartments Kalgoorlie
Central Kalgoorlie
From $47
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per person, per night, 4 share
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Best Western Hospitality Inn Kalgoorlie Hotel
Central Kalgoorlie
From $57
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per person, per night, 2 share
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All Seasons Plaza Kalgoorlie Hotel
Central Kalgoorlie
From $58
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per person, per night, 2 share
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Quality Inn Railway Motel Kalgoorlie
Central Kalgoorlie
From $77
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per person, per night, 2 share
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Broadwater Resort Kalgoorlie Hotel
Central Kalgoorlie
From $82
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Karijini Hotels
Accommodation Western Australia
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Karijini Eco Retreat Luxury Tents Karijini
Central Karijini
From
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Karratha Hotels
Accommodation Western Australia
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Dampier Houseboat House Boat Karratha
Central Karratha
From
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Best Western Karratha Central Apartments Karratha
Central Karratha
From $69
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per person, per night, 5 share
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Kojonup Hotels
Accommodation Western Australia
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Kemminup Farm Homestay Kojonup
Central Kojonup
From $65
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per person, per night, 2 share
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Kununurra Hotels
Accommodation Western Australia
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Kununurra Lakeside Resort Hotel Kununurra
Central Kununurra
From $42
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per person, per night, 2 share
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Hotel Kununurra Hotel
Central Kununurra
From $58
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All Seasons Kununurra Hotel
Central Kununurra
From $63
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Country Club Hotel Kununurra
Central Kununurra
From $82
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Mackeral Islands Hotels
Accommodation Western Australia
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Mackerel Islands Cabins Mackeral Islands
Thevenard Island Mackeral Islands
From $90
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per person, per night, 1 share
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Mandurah Hotels
Accommodation Western Australia
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Atrium Hotel Mandurah
Central Mandurah
From $35
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per person, per night, 6 share
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Quest Mandurah Apartments
Central Mandurah
From $36
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per person, per night, 6 share
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Seashells Resort Mandurah Apartments
Central Mandurah
From $45
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per person, per night, 4 share
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Yalgorup Country Lodge Guesthouse Mandurah
Bouvard Mandurah
From $75
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per person, per night, 2 share
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Margaret River Area Hotels
Accommodation Western Australia
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Moondance Lodge Suites Margaret River Area
Yallingup Margaret River Area
From
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Wallcliffe Lodge Bed And Breakfast Margaret River Area
Central Margaret River Area
From
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Wyadup Brook Cottages Margaret River Area
Central Margaret River Area
From $32
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per person, per night, 6 share
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Forte Leeuwin Apartments Margaret River Apartments Margaret River Area
Margaret River Wineries Margaret River Area
From $39
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Surfpoint Resort Bunkhouse Margaret River Area
Gnarabup Beach Margaret River Area
From $40
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Assured Margarets Beach Resort Hotel Margaret River Area
Central Margaret River Area
From $46
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per person, per night, 4 share
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Regency Beach Club Holiday Homes Margaret River Area
Dunsborough Margaret River Area
From $47
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per person, per night, 10 share
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Assured Margarets Forest Apartments Margaret River Area
Central Margaret River Area
From $50
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per person, per night, 4 share
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Margaret River Holiday Suites Margaret River Area
Central Margaret River Area
From $53
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per person, per night, 2 share
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Margaret River Resort Hotel Margaret River Area
Central Margaret River Area
From $58
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Best Western Dunsborough Motel Margaret River Area
Central Margaret River Area
From $59
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Waterfall Cottages Margaret River Area
Central Margaret River Area
From $60
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per person, per night, 2 share
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Quest Margaret River Apartments Margaret River Area
Central Margaret River Area
From $63
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per person, per night, 4 share
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Comfort Inn Grange On Farrelly Motel Margaret River Area
Central Margaret River Area
From $65
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per person, per night, 2 share
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Margaret River Holiday Cottages Margaret River Area
Central Margaret River Area
From $68
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All Seasons Margaret River Hotel Margaret River Area
Central Margaret River Area
From $68
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Kangaridge Guesthouse Margaret River Area
Central Margaret River Area
From $70
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Broadwater Resort And Spa Dunsborough Hotel Margaret River Area
Dunsborough Margaret River Area
From $80
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Harmony Forest Villas Cottages Margaret River Area
Central Margaret River Area
From $84
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per person, per night, 2 share
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Seashells Caves House Hotel Margaret River Area
Yallingup Margaret River Area
From $88
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Quay West Resort Bunker Bay Hotel Margaret River Area
Bunker Bay Margaret River Area
From $92
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per person, per night, 4 share
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Basildene Manor Guesthouse Margaret River Area
Central Margaret River Area
From $102
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per person, per night, 2 share
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Heritage Trail Lodge Guesthouse Margaret River Area
Central Margaret River Area
From $110
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Cape Lodge Private Hotel Margaret River Area
Central Margaret River Area
From $173
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Hidden Valley Forest Retreat Lodges Margaret River Area
Central Margaret River Area
From $213
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Monkey Mia Area Hotels
Accommodation Western Australia
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Oceanside Village Chalet Monkey Mia Area
Denham Monkey Mia Area
From $26
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per person, per night, 5 share
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Nanga Bay Resort Hotel Monkey Mia Area
Nanga Monkey Mia Area
From $60
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per person, per night, 2 share
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Heritage Resort Hotel Monkey Mia Area
Denham Monkey Mia Area
From $62
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Monkey Mia Dolphin Resort Holiday Village Monkey Mia Area
Central Monkey Mia Area
From $84
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Murchison Hotels
Accommodation Western Australia
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Wooleen Station Stationstay Murchison
Wooleen Murchison
From
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Newman Hotels
Accommodation Western Australia
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Newman Hotel Motel Newman
Central Newman
From
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Seasons Hotel Newman
Central Newman
From $98
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Ningaloo Reef Hotels
Accommodation Western Australia
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Ningaloo Reef Retreat Safari Tents Ningaloo Reef
Cape Range Ningaloo Reef
From $148
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per person, per night, 1 share
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Pemberton Hotels
Accommodation Western Australia
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Forest Lodge Resort Hotel Pemberton
Central Pemberton
From $50
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per person, per night, 2 share
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Best Western Pemberton Hotel
Central Pemberton
From $51
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per person, per night, 2 share
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Karri Forest Motel Pemberton
Central Pemberton
From $55
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Gloucester Motel Pemberton
Central Pemberton
From $59
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per person, per night, 2 share
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Lavender And Berry Farm Cottages Pemberton
Central Pemberton
From $60
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Treenbrook Cottages Pemberton
Central Pemberton
From $63
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per person, per night, 2 share
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Karri Valley Resort Hotel Pemberton
Central Pemberton
From $72
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per person, per night, 2 share
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Pinnacles Desert Area Hotels
Accommodation Western Australia
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Best Western Cervantes Pinnacles Motel Pinnacles Desert Area
Cervantes Pinnacles Desert Area
From $63
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per person, per night, 2 share
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Point Samson Hotels
Accommodation Western Australia
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Point Samson Resort Hotel Point Samson
Central Point Samson
From $104
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per person, per night, 2 share
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Porongurup Ranges Hotels
Accommodation Western Australia
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Karribank Country Retreat Private Hotel Porongurup Ranges
Central Porongurup Ranges
From $60
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per person, per night, 2 share
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The Sleeping Lady Guesthouse Porongurup Ranges
Central Porongurup Ranges
From $75
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per person, per night, 2 share
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Port Hedland Hotels
Accommodation Western Australia
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Walkabout Hotel Port Hedland
Central Port Hedland
From
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Best Western Hospitality Inn Port Hedland Hotel
Central Port Hedland
From $70
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per person, per night, 2 share
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Tom Price Hotels
Accommodation Western Australia
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Karijini Lodge Motel Hotel Tom Price
Central Tom Price
From
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Tom Price Hotel Motel Tom Price
Central Tom Price
From $68
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Walpole Hotels
Accommodation Western Australia
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Che Sara Sara Chalets Farmstay Walpole
Central Walpole
From $50
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per person, per night, 2 share
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Tree Top Walk Motel Walpole
Central Walpole
From $60
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per person, per night, 2 share
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Wyndham Hotels
Accommodation Western Australia
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Diggers Rest Station Stationstay Wyndham
Diggers Rest Wyndham
From
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York Hotels
Accommodation Western Australia
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Bayleaf B&b And Cafe Bed And Breakfast York
Central York
From
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Meadow View B&b Bed And Breakfast York
Central York
From $33
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per person, per night, 4 share
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Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
Price Basis
Hotel Reservation
Country Manor formerly Albany Port Of Call Motel Motel Albany
Central Albany
From $23
Price Table
per person, per night, 2 share
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Best Western Ace Motor Inn Albany Hotel
Central Albany
From $38
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per person, per night, 2 share
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Comfort Inn Albany Hotel
Central Albany
From $38
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per person, per night, 2 share
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Metro Inn Albany Motel
Central Albany
From $47
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per person, per night, 2 share
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My Place Colonial Accommodation Apartments Albany
Central Albany
From $53
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per person, per night, 2 share
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Vancouver Guesthouse Albany
Central Albany
From $55
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per person, per night, 2 share
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Albany Harbourside Apartments Albany
Central Albany
From $68
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per person, per night, 2 share
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B And B By The Sea Bed And Breakfast Albany
Middleton Beach Albany
From $70
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per person, per night, 2 share
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The Beach House At Bayside Guesthouse Albany
Central Albany
From $110
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per person, per night, 2 share
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Broome Hotels
Accommodation Western Australia
Further Property Information
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Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Roebuck Bay Hotel Motel Hotel Broome
Central Broome
From
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Broome Beach Resort Apartments Broome
Cable Beach Broome
From $25
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per person, per night, 6 share
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Cable Beachside Apartments Broome
Cable Beach Broome
From $28
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per person, per night, 6 share
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Habitat Resort Broome Apartments
Central Broome
From $28
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per person, per night, 6 share
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Blue Seas Resort Apartments Broome
Cable Beach Broome
From $29
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per person, per night, 4 share
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Seashells Resort Broome Apartments
Cable Beach Broome
From $32
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per person, per night, 6 share
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Ocean Lodge Holiday Units Broome
Cable Beach Broome
From $36
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per person, per night, 2 share
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Cocos Beach Bungalows Broome
Cable Beach Broome
From $40
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per person, per night, 6 share
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Moonlight Bay Apartments Broome
Central Broome
From $51
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per person, per night, 4 share
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Rendezvous Sanctuary Resort Hotel Broome
Cable Beach Broome
From $54
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per person, per night, 6 share
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Bali Hai Resort Apartments Broome
Cable Beach Broome
From $57
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per person, per night, 4 share
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The Mangrove Resort Hotel Broome
Central Broome
From $61
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per person, per night, 2 share
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Mercure Inn Continental Broome Hotel
Central Broome
From $66
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per person, per night, 2 share
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Mcalpine House Guesthouse Broome
Central Broome
From $100
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per person, per night, 2 share
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Cable Beach Club Resort Broome Hotel
Cable Beach Broome
From $102
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per person, per night, 2 share
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Bunbury Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
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Quest Bunbury Apartments
Central Bunbury
From $41
Price Table
per person, per night, 6 share
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Bunbury Motel And Serviced Apartments Bunbury
Central Bunbury
From $48
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per person, per night, 2 share
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All Seasons Sanctuary Golf Resort Hotel Bunbury
Pelican Point Bunbury
From $65
Price Table
per person, per night, 4 share
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Bungle Bungles Hotels
Accommodation Western Australia
Further Property Information
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Suburb
Location
Star Rating
Priced From
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Purnululu Safari Camp Safari Tents Bungle Bungles
Central Bungle Bungles
From
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Bellburn Bush Camp Safari Tents Bungle Bungles
Central Bungle Bungles
From $87
Price Table
per person, per night, 2 share
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Busselton Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
Priced From
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Bayview Geographe Resort Hotel Busselton
Central Busselton
From $29
Price Table
per person, per night, 6 share
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Forte Cape View Beach Apartments Busselton
Central Busselton
From $36
Price Table
per person, per night, 4 share
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Amalfi Resort Hotel Busselton
Central Busselton
From $41
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per person, per night, 6 share
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Abbey Beach Resort Hotel Busselton
Central Busselton
From $45
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per person, per night, 6 share
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Martin Fields Country Retreat Guesthouse Busselton
Central Busselton
From $70
Price Table
per person, per night, 2 share
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Broadwater Beach Resort Hotel Busselton
Central Busselton
From $72
Price Table
per person, per night, 2 share
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Broadwater Bungalows Busselton
Central Busselton
From $76
Price Table
per person, per night, 2 share
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Cape Leveque Hotels
Accommodation Western Australia
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Suburb
Location
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Priced From
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Kooljaman At Cape Leveque Safari Tents
Central Cape Leveque
From $45
Price Table
per person, per night, 2 share
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Carnarvon Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
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Best Western Hospitality Inn Carnarvon Hotel
Central Carnarvon
From $57
Price Table
per person, per night, 2 share
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Coral Bay Hotels
Accommodation Western Australia
Further Property Information
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Suburb
Location
Star Rating
Priced From
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Bayview Coral Bay Holiday Village
Central Coral Bay
From $27
Price Table
per person, per night, 8 share
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Ningaloo Reef Resort Hotel Coral Bay
Central Coral Bay
From $59
Price Table
per person, per night, 2 share
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Giralia Station Stationstay Coral Bay
Giralia Coral Bay
From $163
Price Table
per person, per night, 2 share
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Denmark Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
Priced From
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The Denmark Waterfront Apartments Hotel Denmark
Central Denmark
From $44
Price Table
per person, per night, 4 share
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Karma Chalets Chalets And Apartments Denmark
Central Denmark
From $65
Price Table
per person, per night, 2 share
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Denmark Observatory Resort formerly Karri Mia Resort Hotel Denmark
Central Denmark
From $75
Price Table
per person, per night, 2 share
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Derby Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
Priced From
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King Sound Resort Hotel Derby
Central Derby
From $69
Price Table
per person, per night, 2 share
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Esperance Hotels
Accommodation Western Australia
Further Property Information
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Suburb
Location
Star Rating
Priced From
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Hotel Reservation
The Doo Drop Inn Bed And Breakfast Esperance
Central Esperance
From
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Woody Island Overnight Camp Safari Tents Esperance
Central Esperance
From $26
Price Table
per person, per night, 2 share
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The Jetty Resort Motel Esperance
Central Esperance
From $35
Price Table
per person, per night, 3 share
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Crokers Park Holiday Resort Holiday Village Esperance
Central Esperance
From $38
Price Table
per person, per night, 2 share
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The Old Hospital Motel Esperance
Central Esperance
From $43
Price Table
per person, per night, 2 share
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Island View Apartments formerley Esperance Seaside Apartments Apartments Esperance
Central Esperance
From $45
Price Table
per person, per night, 6 share
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Esperance Beach House Apartments Esperance
Central Esperance
From $50
Price Table
per person, per night, 4 share
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All Seasons Esplanade Apartments Esperance
Central Esperance
From $53
Price Table
per person, per night, 2 share
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Best Western Hospitality Inn Esperance Hotel
Central Esperance
From $57
Price Table
per person, per night, 2 share
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Comfort Inn Bay Of Isles Motel Esperance
Central Esperance
From $60
Price Table
per person, per night, 2 share
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Exmouth Hotels
Accommodation Western Australia
Further Property Information
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Suburb
Location
Star Rating
Priced From
Price Basis
Hotel Reservation
Novotel Ningaloo Resort Exmouth
Central Exmouth
From
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Exmouth Cape Holiday Park formerley Exmouth Cape Tourist Village Holiday Village Exmouth
Central Exmouth
From $24
Price Table
per person, per night, 1 share
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Ningaloo Lodge Guesthouse Exmouth
Central Exmouth
From $38
Price Table
per person, per night, 2 share
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Potshot Hotel Resort Hotel Exmouth
Central Exmouth
From $45
Price Table
per person, per night, 2 share
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Best Western Sea Breeze Resort Hotel Exmouth
Central Exmouth
From $56
Price Table
per person, per night, 2 share
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Fitzroy Crossing Hotels
Accommodation Western Australia
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Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Fitzroy River Lodge Hotel Fitzroy Crossing
Central Fitzroy Crossing
From $68
Price Table
per person, per night, 2 share
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Geraldton Hotels
Accommodation Western Australia
Further Property Information
Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
Price Basis
Hotel Reservation
All Seasons Geraldton Hotel
Central Geraldton
From $52
Price Table
per person, per night, 2 share
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Batavia Motor Inne Hotel Geraldton
Central Geraldton
From $53
Price Table
per person, per night, 2 share
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Best Western Hospitality Inn Geraldton Hotel
Central Geraldton
From $57
Price Table
per person, per night, 2 share
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African Reef Resort Hotel Geraldton
Central Geraldton
From $105
Price Table
per person, per night, 1 share
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Gibb River Road Area Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Imintji Safari Camp Safari Tents Gibb River Road Area
Bell Gorge Gibb River Road Area
From
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Ungolan Safari Camp Safari Tents Gibb River Road Area
Mitchell Plateau Gibb River Road Area
From
Price Table
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Marunbabidi Safari Camp Safari Tents Gibb River Road Area
King Edward River Gibb River Road Area
From
Price Table
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El Questro Wilderness Park Hotel Gibb River Road Area
Central Gibb River Road Area
From
Price Table
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Drysdale River Station Stationstay Gibb River Road Area
Drysdale River Gibb River Road Area
From
Price Table
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Home Valley Homestead Stationstay Gibb River Road Area
Central Gibb River Road Area
From
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Charnley River Station Stationstay Gibb River Road Area
Gorges Gibb River Road Area
From $60
Price Table
per person, per night, 2 share
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Mt Elizabeth Station Stationstay Gibb River Road Area
Mt Elizabeth Gibb River Road Area
From $99
Price Table
per person, per night, 1 share
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Mornington Wilderness Camp Safari Tents Gibb River Road Area
Central Gibb River Road Area
From $190
Price Table
per person, per night, 2 share
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Greenhead Hotels
Accommodation Western Australia
Further Property Information
Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Maccas Mooring Bed And Breakfast Greenhead
Central Greenhead
From $60
Price Table
per person, per night, 2 share
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Halls Creek Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
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Hotel Reservation
Best Western Halls Creek Motel
Central Halls Creek
From $65
Price Table
per person, per night, 2 share
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Kimberley Hotel Halls Creek
Central Halls Creek
From $67
Price Table
per person, per night, 2 share
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Kalbarri Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Kalbarri Murchison View Apartments Kalbarri
Central Kalbarri
From $17
Price Table
per person, per night, 6 share
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Kalbarri Seafront Villas Kalbarri
Central Kalbarri
From $38
Price Table
per person, per night, 4 share
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Best Western Kalbarri Palm Resort Hotel Kalbarri
Central Kalbarri
From $60
Price Table
per person, per night, 2 share
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Kalgoorlie Hotels
Accommodation Western Australia
Further Property Information
Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
Price Basis
Hotel Reservation
Palace Hotel Kalgoorlie
Central Kalgoorlie
From
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Kalgoorlie Overland Motel Hotel Kalgoorlie
Central Kalgoorlie
From $47
Price Table
per person, per night, 2 share
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Kalgoorlie Accommodation Village Holiday Village Kalgoorlie
Central Kalgoorlie
From $47
Price Table
per person, per night, 2 share
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Quest Yelverton Apartments Kalgoorlie
Central Kalgoorlie
From $47
Price Table
per person, per night, 4 share
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Best Western Hospitality Inn Kalgoorlie Hotel
Central Kalgoorlie
From $57
Price Table
per person, per night, 2 share
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All Seasons Plaza Kalgoorlie Hotel
Central Kalgoorlie
From $58
Price Table
per person, per night, 2 share
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Quality Inn Railway Motel Kalgoorlie
Central Kalgoorlie
From $77
Price Table
per person, per night, 2 share
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Broadwater Resort Kalgoorlie Hotel
Central Kalgoorlie
From $82
Price Table
per person, per night, 2 share
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Karijini Hotels
Accommodation Western Australia
Further Property Information
Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
Price Basis
Hotel Reservation
Karijini Eco Retreat Luxury Tents Karijini
Central Karijini
From
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Karratha Hotels
Accommodation Western Australia
Further Property Information
Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Dampier Houseboat House Boat Karratha
Central Karratha
From
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Best Western Karratha Central Apartments Karratha
Central Karratha
From $69
Price Table
per person, per night, 5 share
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Kojonup Hotels
Accommodation Western Australia
Further Property Information
Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Kemminup Farm Homestay Kojonup
Central Kojonup
From $65
Price Table
per person, per night, 2 share
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Kununurra Hotels
Accommodation Western Australia
Further Property Information
Overview - Facilities - Room Types - Pricing
Suburb
Location
Star Rating
Priced From
Price Basis
Hotel Reservation
Kununurra Lakeside Resort Hotel Kununurra
Central Kununurra
From $42
Price Table
per person, per night, 2 share
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Hotel Kununurra Hotel
Central Kununurra
From $58
Price Table
per person, per night, 2 share
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All Seasons Kununurra Hotel
Central Kununurra
From $63
Price Table
per person, per night, 2 share
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Country Club Hotel Kununurra
Central Kununurra
From $82
Price Table
per person, per night, 2 share
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Mackeral Islands Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
Priced From
Price Basis
Hotel Reservation
Mackerel Islands Cabins Mackeral Islands
Thevenard Island Mackeral Islands
From $90
Price Table
per person, per night, 1 share
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Mandurah Hotels
Accommodation Western Australia
Further Property Information
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Suburb
Location
Star Rating
Priced From
Price Basis
Hotel Reservation
Atrium Hotel Mandurah
Central Mandurah
From $35
Price Table
per person, per night, 6 share
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Quest Mandurah Apartments
Central Mandurah
From $36
Price Table
per person, per night, 6 share
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Seashells Resort Mandurah Apartments
Central Mandurah
From $45
Price Table
per person, per night, 4 share
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Yalgorup Country Lodge Guesthouse Mandurah
Bouvard Mandurah
From $75
Price Table
per person, per night, 2 share
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Margaret River Area Hotels
Accommodation Western Australia
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Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Moondance Lodge Suites Margaret River Area
Yallingup Margaret River Area
From
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Wallcliffe Lodge Bed And Breakfast Margaret River Area
Central Margaret River Area
From
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Wyadup Brook Cottages Margaret River Area
Central Margaret River Area
From $32
Price Table
per person, per night, 6 share
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Forte Leeuwin Apartments Margaret River Apartments Margaret River Area
Margaret River Wineries Margaret River Area
From $39
Price Table
per person, per night, 6 share
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Surfpoint Resort Bunkhouse Margaret River Area
Gnarabup Beach Margaret River Area
From $40
Price Table
per person, per night, 2 share
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Assured Margarets Beach Resort Hotel Margaret River Area
Central Margaret River Area
From $46
Price Table
per person, per night, 4 share
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Regency Beach Club Holiday Homes Margaret River Area
Dunsborough Margaret River Area
From $47
Price Table
per person, per night, 10 share
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Assured Margarets Forest Apartments Margaret River Area
Central Margaret River Area
From $50
Price Table
per person, per night, 4 share
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Margaret River Holiday Suites Margaret River Area
Central Margaret River Area
From $53
Price Table
per person, per night, 2 share
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Margaret River Resort Hotel Margaret River Area
Central Margaret River Area
From $58
Price Table
per person, per night, 4 share
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Best Western Dunsborough Motel Margaret River Area
Central Margaret River Area
From $59
Price Table
per person, per night, 2 share
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Waterfall Cottages Margaret River Area
Central Margaret River Area
From $60
Price Table
per person, per night, 2 share
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Quest Margaret River Apartments Margaret River Area
Central Margaret River Area
From $63
Price Table
per person, per night, 4 share
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Comfort Inn Grange On Farrelly Motel Margaret River Area
Central Margaret River Area
From $65
Price Table
per person, per night, 2 share
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Margaret River Holiday Cottages Margaret River Area
Central Margaret River Area
From $68
Price Table
per person, per night, 2 share
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All Seasons Margaret River Hotel Margaret River Area
Central Margaret River Area
From $68
Price Table
per person, per night, 2 share
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Kangaridge Guesthouse Margaret River Area
Central Margaret River Area
From $70
Price Table
per person, per night, 2 share
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Broadwater Resort And Spa Dunsborough Hotel Margaret River Area
Dunsborough Margaret River Area
From $80
Price Table
per person, per night, 2 share
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Harmony Forest Villas Cottages Margaret River Area
Central Margaret River Area
From $84
Price Table
per person, per night, 2 share
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Seashells Caves House Hotel Margaret River Area
Yallingup Margaret River Area
From $88
Price Table
per person, per night, 2 share
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Quay West Resort Bunker Bay Hotel Margaret River Area
Bunker Bay Margaret River Area
From $92
Price Table
per person, per night, 4 share
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Basildene Manor Guesthouse Margaret River Area
Central Margaret River Area
From $102
Price Table
per person, per night, 2 share
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Heritage Trail Lodge Guesthouse Margaret River Area
Central Margaret River Area
From $110
Price Table
per person, per night, 2 share
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Cape Lodge Private Hotel Margaret River Area
Central Margaret River Area
From $173
Price Table
per person, per night, 2 share
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Hidden Valley Forest Retreat Lodges Margaret River Area
Central Margaret River Area
From $213
Price Table
per person, per night, 2 share
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Monkey Mia Area Hotels
Accommodation Western Australia
Further Property Information
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Suburb
Location
Star Rating
Priced From
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Hotel Reservation
Oceanside Village Chalet Monkey Mia Area
Denham Monkey Mia Area
From $26
Price Table
per person, per night, 5 share
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Nanga Bay Resort Hotel Monkey Mia Area
Nanga Monkey Mia Area
From $60
Price Table
per person, per night, 2 share
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Heritage Resort Hotel Monkey Mia Area
Denham Monkey Mia Area
From $62
Price Table
per person, per night, 2 share
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Monkey Mia Dolphin Resort Holiday Village Monkey Mia Area
Central Monkey Mia Area
From $84
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per person, per night, 2 share
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Murchison Hotels
Accommodation Western Australia
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Wooleen Station Stationstay Murchison
Wooleen Murchison
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Newman Hotels
Accommodation Western Australia
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Newman Hotel Motel Newman
Central Newman
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Seasons Hotel Newman
Central Newman
From $98
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Ningaloo Reef Hotels
Accommodation Western Australia
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Ningaloo Reef Retreat Safari Tents Ningaloo Reef
Cape Range Ningaloo Reef
From $148
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Pemberton Hotels
Accommodation Western Australia
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Forest Lodge Resort Hotel Pemberton
Central Pemberton
From $50
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Best Western Pemberton Hotel
Central Pemberton
From $51
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Karri Forest Motel Pemberton
Central Pemberton
From $55
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Gloucester Motel Pemberton
Central Pemberton
From $59
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Lavender And Berry Farm Cottages Pemberton
Central Pemberton
From $60
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Treenbrook Cottages Pemberton
Central Pemberton
From $63
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Karri Valley Resort Hotel Pemberton
Central Pemberton
From $72
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Pinnacles Desert Area Hotels
Accommodation Western Australia
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Best Western Cervantes Pinnacles Motel Pinnacles Desert Area
Cervantes Pinnacles Desert Area
From $63
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Point Samson Hotels
Accommodation Western Australia
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Point Samson Resort Hotel Point Samson
Central Point Samson
From $104
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Porongurup Ranges Hotels
Accommodation Western Australia
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Karribank Country Retreat Private Hotel Porongurup Ranges
Central Porongurup Ranges
From $60
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The Sleeping Lady Guesthouse Porongurup Ranges
Central Porongurup Ranges
From $75
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Port Hedland Hotels
Accommodation Western Australia
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Walkabout Hotel Port Hedland
Central Port Hedland
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Best Western Hospitality Inn Port Hedland Hotel
Central Port Hedland
From $70
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Tom Price Hotels
Accommodation Western Australia
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Karijini Lodge Motel Hotel Tom Price
Central Tom Price
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Tom Price Hotel Motel Tom Price
Central Tom Price
From $68
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Walpole Hotels
Accommodation Western Australia
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Che Sara Sara Chalets Farmstay Walpole
Central Walpole
From $50
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Tree Top Walk Motel Walpole
Central Walpole
From $60
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Wyndham Hotels
Accommodation Western Australia
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Diggers Rest Station Stationstay Wyndham
Diggers Rest Wyndham
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York Hotels
Accommodation Western Australia
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Bayleaf B&b And Cafe Bed And Breakfast York
Central York
From
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Meadow View B&b Bed And Breakfast York
Central York
From $33
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per person, per night, 4 share
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