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Osmium (76Os190.23)
[7440-04-2]

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Elemental Form

One of the platinum group metals, osmium is bluish-white, lustrous, extremely hard and brittle. Its properties make it ideal for combining with other platinum metals to produce very hard alloys. Osmium has the highest melting point and lowest vapor pressure of the platinum group and it is very difficult to fabricate. While osmium powder or sponge is affected by air at room temperature, the metal is relatively inert in ambient conditions.
Melting Point3045°CBoiling Point5027°C
Density22.61g/cm3Themal Conductivity0.205cal/cm2/cm/s/°C
Themal Conductivity @ 0°C0.031cal/gHeat of Fusion6.4k-cal/g-atom
Heat of Vaporization162k-cal/g-atomAtomic Volume8.43W/D
First Ionization Energy201K-cal/g-moleElectronegativity2.2Pauling's
Covalent Radius1.26AngstromsVickers Hardness (annealed)400
Linear Coefficient of Expansion6.1x10-6K-1Electrical Resistivity8.12µΩ-cm
Crystal StructureHexagonalThermal Neutron Cross Section15.3Gauss
Young's Modulus of Elasticity81x106psiMagnetic Susceptibility0.074x10-6cgs
Ionization Potential8.7volts