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Platinum Metals Rev., 1963, 7, (4), 147

Reference Data: Physical Properties of the Platinum Metals

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The April 1957 issue of Platinum Metals Review included a table of the properties of the six platinum metals. This table has now been revised to include more recent determinations of certain of these properties.

PlatinumIridiumOsmiumPalladiumRhodiumRuthenium
Atomic number 78 77 76 46 45 44
Atomic weight 195.09 192.2 190.2 106.4 1O2.905 101.07
Thermal neutron cross section, barns 9 440 15 8 156 2.6
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 c/a 3.9231 3.8394 2.73411.5800 3.8907 3.8031 2.70561.5820
Density at 20°C 21.45 22.65 22.61 12.O2 12.41 12.45
Melting point, °C 1769 2443 3050 1552 1960 2310
Thermal conductivity, (0-100°C), joule cm/cm2/ sec/°C 0.73 1.48 0.87 0.76 1.50 1.05
Specific heat, cal/ g/°C at 0°C 0.03136 0.0307 0.0309 0.0584 0.0589 0.0551
Coefficient of linear expansion (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 10−8
Resistivity, microhm-cm at 0°C 9.85 4.71 8.12 9.93 4.33 6.71
Temperature coefficient of resistance (0-100°C) 0.0039 0.0043 0.0042 0.0038 0.0046 0.0042
Thermal e.m.f. against platinum at 1000°, mV + 12.73 −11.505 + 14.05
Mass susceptibility, χ, cm3/g× 106 + 0.9712 + 0.133 + 0.052 + 5.231 + 0.9903 + 0.427
Thermionic function A, amp. cm−3(°K)−2 64 170 60 100
Work function, Ø volts 5.27 5.40 4.99 4.90
Tensile strength, annealed, lb/in.2 18,000 160,000 25,000 100,000
Modulus of elasticity in tension, lb/in.2× 10−6 25 75 81 17 46 60
Hardness,annealed, Hv 40–42 200–240 300–670 40–42 100–120 200–350

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