Journal Archive

Platinum Metals Rev., 1972, 16, (2), 59

Physical Properties of the Platinum Metals

Platinum Metals Review last published a table of the properties of the six platinum metals in October 1963. This revised table includes some more recently determined values and is expressed in SI units where appropriate.

Platinum Iridium Osmium Palladium Rhodium Ruthenium
Atomic number 78 77 76 46 45 44
Atomic weight 195.09 192.22 190.2 106.4 102.9055 101.07
Thermal neutron cross section, barns 9±1 425±15 15.3±0.7 6.0±1.0 150±5 3.0±0.8
Lattice structure F.c.c. F.c.c. C.p.h. F.c.c. F.c.c. C.p.h.
Lattice constants at 20°C, Å a 3.9229 3.8392 2.7340 3.8906 3.8029 2.7056
c/a 1.5799 1.5825
Density at 20°C, kg/m3 21450 22650 22610 12020 12410 12450
Melting point, °C 1768 2443 3050 1552 1960 2310
Thermal conductivity at 0−100°C, W/mK 73 148 87 76 150 105
Specific heat at 0°C, J/kg K 131.2 128.4 129.3 244.3 246.4 230.5
Coefficient of linear expansion at 20−100°C, × 106 9.1 6.8 6.1 11.1 8.3 9.1
Vapour pressure at 1500°C, Torr 10−6 10−8 10−12 10−2 10−6 10−5
Resistivity at 0°C, μ ohm.cm 9.85 4.71 8.12 9.93 4.33 6.80
Temperature coefficient of resistance at 0−100°C 0.0039 0.0043 0.0042 0.0038 0.0046 0.0042
Thermal e.m.f. against platinum at 1000°C, mV + 12.73 −11.505 + 14.05 +9.760
Mass susceptibility χ, cm3/g, × 106 +0.9712 +0.133 +0.052 +5.231 +0.9903 +0.427
Thermionic function, A/cm2K2 64 170 120 60 100
Work function φ, V 5.27 5.40 4.8 4.99 4.90 > 4.54
Tensile strength, annealed, Ib/in2, × 103 18 160 25 100 72
kN/m2, × 103 124 1100 172 688 496
Modulus of elasticity in tension, lb/in2, × 106 25 75 81 17 46 60
kN/m2, × 106 172 516 556 117 316 417
Hardness,annealed, Hv 40–42 200–240 300–670 40–42 100–102 200–350
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