Tuesday, August 14, 2007

Rhodium

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Rhodium
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Rh redirects here. For other uses, see rh (disambiguation)
45 ruthenium ← rhodium → palladium
Co

Rh

Ir
Periodic Table - Extended Periodic Table


General
Name, Symbol, Number rhodium, Rh, 45
Chemical series transition metals
Group, Period, Block 9, 5, d
Appearance silvery white metallic

Standard atomic weight 102.90550(2)  g·mol−1
Electron configuration [Kr] 4d8 5s1
Electrons per shell 2, 8, 18, 16, 1
Physical properties
Phase solid
Density (near r.t.) 12.41  g·cm−3
Liquid density at m.p. 10.7  g·cm−3
Melting point 2237 K
(1964 °C, 3567 °F)
Boiling point 3968 K
(3695 °C, 6683 °F)
Heat of fusion 26.59  kJ·mol−1
Heat of vaporization 494  kJ·mol−1
Heat capacity (25 °C) 24.98  J·mol−1·K−1
Vapor pressure P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 2288 2496 2749 3063 3405 3997

Atomic properties
Crystal structure cubic face centered
Oxidation states 2, 3, 4
(amphoteric oxide)
Electronegativity 2.28 (scale Pauling)
Ionization energies 1st: 719.7 kJ/mol
2nd: 1740 kJ/mol
3rd: 2997 kJ/mol
Atomic radius 135  pm
Atomic radius (calc.) 173  pm
Covalent radius 135  pm
Miscellaneous
Magnetic ordering no data
Electrical resistivity (0 °C) 43.3 nΩ·m
Thermal conductivity (300 K) 150  W·m−1·K−1
Thermal expansion (25 °C) 8.2  µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 4700 m/s
Young's modulus 275  GPa
Shear modulus 150  GPa
Bulk modulus 380  GPa
Poisson ratio 0.26
Mohs hardness 6.0
Vickers hardness 1246  MPa
Brinell hardness 1100  MPa
CAS registry number 7440-16-6
Selected isotopes
Main article: Isotopes of rhodium iso NA half-life DM DE (MeV) DP
99Rh syn 16.1 d ε - 99Ru
γ 0.089, 0.353,
0.528 -
101mRh syn 4.34 d ε - 101Ru
IT 0.157 101Rh
γ 0.306, 0.545 -
101Rh syn 3.3 y ε - 101Ru
γ 0.127, 0.198,
0.325 -
102mRh syn 2.9 y ε - 102Ru
γ 0.475, 0.631,
0.697, 1.046 -
102Rh syn 207 d ε - 102Ru
β+ 0.826, 1.301 102Ru
β- 1.151 102Pd
γ 0.475, 0.628 -
103Rh 100% Rh is stable with 58 neutrons
105Rh syn 35.36 h β- 0.247, 0.260,
0.566 105Pd
γ 0.306, 0.318 -

References
Rhodium (IPA: /ˈrəʊdiəm/) is a chemical element in the periodic table that has the symbol Rh and atomic number 45. A rare silvery-white hard transition metal, rhodium is a member of the platinum group, is found in platinum ores and is used in alloys with platinum and as a catalyst. It is the most expensive precious metal.[1]

Contents [hide]
1 Notable characteristics
2 Applications
3 History
4 Occurrence
4.1 Normal mining
4.2 As a fission product
5 Isotopes
6 Precautions
7 Symbolic uses
8 See also
9 References
10 External links



[edit] Notable characteristics
Rhodium is a hard silvery white and durable metal that has a high reflectance. Rhodium metal does not normally form an oxide, even when heated. Oxygen is absorbed from the atmosphere at the melting point of rhodium, but on solidification the oxygen is released.[2] Rhodium has both a higher melting point and lower density than platinum. It is not attacked by acids: it is completely insoluble in nitric acid and dissolves slightly in aqua regia. A complete dissolution of rhodium in powder form is only obtained in sulfuric acid.


[edit] Applications
The primary use of this element is as an alloying agent for hardening platinum and palladium. These alloys are used in furnace windings, bushings for glass fiber production, thermocouple elements, electrodes for aircraft spark plugs, and laboratory crucibles. Other uses include:

It is used as an electrical contact material due to its low electrical resistance, low and stable contact resistance, and its high corrosion resistance.
Plated rhodium, made by electroplating or evaporation, is extremely hard and is used for optical instruments.
This metal finds use in jewelry and for decorations. It is electroplated on white gold and platinum to give it a reflective white surface. This is known as rhodium flashing in the jewelry business. It also may be used in coating Sterling Silver in order to strengthen the metal from tarnish, as a result from the copper compound found in Sterling Silver.
It is also a highly useful catalyst in a number of industrial processes (notably it is used in the catalytic system of automobile catalytic converters and for catalytic carbonylation of methanol to produce acetic acid by the Monsanto process). It is used to catalyse addition of hydrosilanes to a double bond, a process important in manufacture of certain silicone rubbers.
The complex of a rhodium ion with BINAP gives a widely used chiral catalyst for chiral synthesis, as in the synthesis of menthol.
It is also used as a filter in mammography systems because of the characteristic x-rays it produces.

[edit] History
Rhodium (Greek rhodon meaning "Rose") was discovered in 1803 by William Hyde Wollaston,[3] soon after his discovery of palladium. He made this discovery in England using crude platinum ore that he presumably obtained from South America.

His procedure involved dissolving the ore in aqua regia, neutralizing the acid with sodium hydroxide (NaOH). He then precipitated the platinum by adding ammonium chloride, NH4Cl, as ammonium chloroplatinate. The element palladium was removed as palladium cyanide after treating the solution with mercuric cyanide. The material that remained was a red rhodium(III) chloride: rhodium metal was isolated via reduction with hydrogen gas.


[edit] Occurrence

[edit] Normal mining
The industrial extraction of rhodium is complex as the metal occurs in ores mixed with other metals such as palladium, silver, platinum, and gold. It is found in platinum ores and obtained free as a white inert metal which it is very difficult to fuse. Principal sources of this element are located in South Africa, in river sands of the Ural Mountains, in North and South America and also in the copper-nickel sulfide mining area of the Sudbury, Ontario region. Although the quantity at Sudbury is very small, the large amount of nickel ore processed makes rhodium recovery cost effective. The main exporter of rhodium is South Africa (>80%) followed by Russia. The annual world production of this element is only about 20 tons and there are very few rhodium minerals. It is generally difficult to determine if a rock sample contains platinum group elements. As of 2006, rhodium cost approximately six times as much as gold, by weight. Rhodium's typical historical price is about $1,000/troy oz,[4] but in recent years it increased to about $6,000/troy oz.[5]


[edit] As a fission product
It is also possible to extract rhodium from used nuclear fuel, which contains rhodium (1 kg of the fission products of 235U contain 13.3 grams of 103Rh. So as a typical used fuel is 3% fission products by weight it will contain about 400 grams of rhodium per ton of used fuel. The longest lived radioisotope of rhodium is 102mRh which has a half life of 2.9 years, while the ground state (102Rh)has a half life of 207 days.

Each kilo of fission rhodium will contain 6.62 ng of 102Rh and 3.68 ng of 102mRh. As 102Rh decays by beta decay to either 102Ru (80%) (some Positron emission will occur) or 102Pd (20%) (some gamma ray photons with about 500 keV are generated) and the excited state decays by beta decay (electron capture) to 102Ru (some gamma ray photons with about 1 MeV are generated). If the fission occurs in an instant then 13.3 grams of rhodium will contain 67.1 MBq (1.81 mCi) of 102Rh and 10.8 MBq (291 μCi) of 102mRh. As it is normal to allow used nuclear fuel to stand for about five years before reprocessing, much of this activity will decay away leaving 4.7 MBq of 102Rh and 5.0 MBq of 102mRh. If the rhodium metal was then left for 20 years after fission then the 13.3 grams of rhodium metal would contain 1.3 kBq of 102Rh and 500 kBq of 102mRh. At first glance the rhodium might be adding to the resource value of reprocessed fission waste, but the cost of the separation of the rhodium from the other metals needs to be considered.


The radioactivity in MBq per gram of each of the platinum group metals which are formed by the fission of uranium, it is important to note that of the metals that ruthenium is the most radioactive. Palladium has an almost constant activity due to the very long lived 107Pd while rhodium is the least radioactive
[edit] Isotopes
Main article: isotopes of rhodium
Naturally occurring rhodium is composed of only one isotope, 103Rh. The most stable radioisotopes are 101Rh with a half-life of 3.3 years, 102Rh with a half-life of 207 days, 102mRh with a half-life of 2.9 years, and 99Rh with a half-life of 16.1 days. Twenty other radioisotopes have been characterized with atomic weights ranging from 92.926 u (93Rh) to 116.925 u (117Rh). Most of these have half-lifes that are less than an hour except 100Rh (half-life: 20.8 hours) and 105Rh (half-life: 35.36 hours). There are also numerous meta states with the most stable being 102mRh (0.141 MeV) with a half-life of about 207 days and 101mRh (0.157 MeV) with a half-life of 4.34 days. See isotopes of rhodium.

The primary decay mode before the only stable isotope, 103Rh, is electron capture and the primary mode after is beta emission. The primary decay product before 103Rh is ruthenium and the primary product after is palladium.


[edit] Precautions
Rhodium metal is, as a noble metal, inert.

However, when rhodium is chemically bound, it is reactive. Rhodium compounds are not often encountered by most people and should be considered to be highly toxic and carcinogenic. Lethal intake (LD50) for rats is 12.6 mg/kg of rhodium chloride (RhCl3). Rhodium compounds can stain human skin very strongly. The element plays no biological role in humans. However, if used plainly, without compounds, the metal is harmless.


[edit] Symbolic uses
Rhodium has been used for honours, or to symbolize wealth, when more commonly used metals such as silver, gold, or platinum are deemed insufficient. In 1979 the Guinness Book of World Records gave Paul McCartney a rhodium-plated disc for being history's all-time best-selling songwriter and recording artist. Guinness has also noted items such as the world's "Most Expensive Pen" or "Most Expensive Board Game" as containing rhodium.


[edit] See also
Rhodium compounds

[edit] References
^ http://www.taxfreegold.co.uk/preciousmetalpricesindx.html
^ Emsley, John (2001). Nature's Building Blocks, (Hardcover, First Edition), Oxford University Press, page 363. ISBN 0198503407.
^ WebElements - The History of Rhodium
^ http://periodic.lanl.gov/elements/45.html
^ KITCO Rhodium Price Charts

[edit] External links
WebElements.com – Rhodium
Current Rhodium price
Los Alamos National Laboratory – Rhodium

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