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

Physical Properties of the Platinum Metals

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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.

PlatinumIridiumOsmiumPalladiumRhodiumRuthenium
Atomic number787776464544
Atomic weight195.09192.22190.2106.4102.9055101.07
Thermal neutron cross section, barns9±1425±1515.3±0.76.0±1.0150±53.0±0.8
Lattice structureF.c.c.F.c.c.C.p.h.F.c.c.F.c.c.C.p.h.
Lattice constants at 20°C, Å a 3.92293.83922.73403.89063.80292.7056
c/a 1.57991.5825
Density at 20°C, kg/m3214502265022610120201241012450
Melting point, °C176824433050155219602310
Thermal conductivity at 0−100°C, W/mK731488776150105
Specific heat at 0°C, J/kg K131.2128.4129.3244.3246.4230.5
Coefficient of linear expansion at 20−100°C, × 1069.16.86.111.18.39.1
Vapour pressure at 1500°C, Torr10−610−810−1210−210−610−5
Resistivity at 0°C, μ ohm.cm9.854.718.129.934.336.80
Temperature coefficient of resistance at 0−100°C0.00390.00430.00420.00380.00460.0042
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/cm2K26417012060100
Work function φ, V5.275.404.84.994.90> 4.54
Tensile strength, annealed, Ib/in2, × 103181602510072
kN/m2, × 1031241100172688496
Modulus of elasticity in tension, lb/in2, × 106257581174660
kN/m2, × 106172516556117316417
Hardness,annealed, Hv40–42200–240300–67040–42100–102200–350

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