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Platinum Group Metals

  • Platinum iridium alloy sheet
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Platinum Group Metals

Platinum group metals have similar physical and chemical properties as well as their own unique characteristics.Their common characteristics are: except osmium and ruthenium are steel gray, the rest ones are silvery white; High melting point, high strength, thermal stability, high resistance to spark erosion, excellent corrosion resistance, strong oxidation resistance and good catalytic activity.Their respective properties determine different uses. For example, platinum has good plastic and stable resistance and resistance temperature coefficient, which can be forged into platinum wire and platinum foil.It does not combine with oxygen, it is not eroded by acid or alkali, it is only dissolved in hot aqua regia.Palladium can be dissolved in concentrated nitric acid, which can absorb 350 ~ 850 times the volume of hydrogen at room temperature.Rhodium and iridium insoluble in aqua regia, can react with molten sodium hydroxide and sodium peroxide to produce compounds dissolved in acid;Osmium and ruthenium are not soluble in aqua regia, but are easily oxidized to four oxides.

The Thermodynamic Properties of Platinum Group Metals
Platinum group metals Ru Rh Pd Os Ir Pt
Superconducting Temperature(Te)/K 0.48 0.000325 - 0.64 0.1125 -
Electron Specific Heat coefficient.(γ)/mJ·mol-1·K-2 3.00 4.65 9.42 2.05 3.20 6.54
Debye temperature(θD)/K 550 512 272 467 420 236
Thermodynamic Properties of Platinum Group Metals (gas phase) at 298.15K.
Platinum Group Metals Ru Rh Pd Os Ir Pt
Mole Specific Heat Capacity 21.524 21.014 20.786 20.788 20.788 25.531
Enthalpy 6235.2 6206.6 6197.4 6197.4 6197.4 6576.4
Entropy 186.509 185.827 167.066 192.579 193.584 192.409
Thermodynamic Properties of Platinum Group Metals (solid phase) at 298.15K.
Platinum Group Metals Ru Rh Pd Os Ir Pt
Mole Specific Heat Capacity 24.05 24.90 25.85 24.69 25.09 25.65
Enthalpy 4577 4914 5444 4992 5266 5694
Entropy 28.50 31.56 37.64 32.56 35.49 41.53
Sublimation Heat 649 558 377 788 670 565
The Melting Properties of Platinum Group Metals
Platinum Group Metals Ru Rh Pd Os Ir Pt
Melting Point 2606 2236 1828.0 3400 2719 2041.3
Melting Heat 39.0 27.3 16.6 70.0 41.3 21.3
Melting Entropy 15.0 12.2 8.8 20.6 15.2 10.4
Melting Vapour Pressure 1.05 0.505 4.23 7.75 0.984 0.019

Effect of different alloying elements on the hardness of annealed platinum alloy

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