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Journal Archive

Platinum Metals Rev., 1957, 1, (2), 61

Reference Data: Physical Properties of the Platinum Metals

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PlatinumIridiumOsmiumPalladiumRhodiumRuthenium
Atomic number 78 77 76 46 45 44
Atomic weight 195.23 193.1 190.2 106.7 102.91 101.7
Lattice structure F.c. cube F.c. cube C.p. hex F.c. cube F.c. cube C.p. hex
Lattice constants, a 3.92 3.83 2.72 3.88 3.80 2.70
c 4.314 4.27
Density at 20°C 21.4 22.4 22.5 11.9 12.4 12.3
Melting point, °C 1769 2442 >2550 1552 1960 > 2550
Thermal conductivity, C.G.S. units 0.17 0.35 0.17 0.36
Specific heat, cal/gm/°C at 20°C 0.032 0.032 0.031 0.058 0.059 0.031
Coefficient of linear expansion (0-100°C) 8.9 × 10−6 6.5 × 10−6 6.6 × 10−6 11.7 × 10−6 8.5 × 10−6 9.6 × 10−6
Resistivity, microhm-centimetres at 20°C 10.6 5.3 9.5 10.7 4.7 9.5
Temperature coefficient of resistance (0-100°C) 0.0039 0.004 0.0042 0.0038 0.0046 0.0042
Mass susceptibility +1.10 × 10−6 +0.15 × 10−6 +0.05 × 10−6 +5.4 × 10−6 +1.11 × 10−6 +0.50 × 10−6
Thermionic functions, A, amp. cm−2(°K)−2 32 60 33
ø, volts (work function) 5.32 5.40 4.99 4.80
Tensile strength—annealed—tons/in2 10 16 10 24
Limit of proportionality — annealed—tons/in2 2 2
Elongation—annealed—per cent 40 40 5
Modulus of elasticity in tension, lb/in2 22 × 106 74 × 106 16 × 106 40 × 106
Hardness—annealed—V.P.H. 40 220 350 40 100 240

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