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RUTHENIUM (44Ru101.07)

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Ruthenium, a member of the platinum group, is a hard, lustrous, white metal that does not tarnish at room temperatures. It does not occur native, but in combination with other platinum group metals. Ruthenium combines with platinum and palladium as an effective hardner, creating alloys that are extremely wear resistant. It improves the corrosion resistance of titanium and is superconductive when combined with molybdenum.

Property Name Property Value Property Name Property Value
Atomic Code (44Ru101.07) First Ionization Energy 173K-cal/g-mole
CAS # 7440-18-8 Electronegativity 2.2Pauling's
Covalent Radius 1.25Angstroms
Melting Point 2334°C Vickers Hardness (annealed) 220
Boiling Point 4150°C Linear Coefficient of Expansion 9.1x10-6K-1
Density 12.45g/cm3 Electrical Resistivity @ 20°C 7.2µΩ-cm
Specific Heat @ 20°C 0.055cal/g°C Crystal Structure Hexagonal
Heat of Fusion 6.1k-cal/g-atom Vapor Pressure @ M.P. 9.8mmHg
Heat of Vaporization 148k-cal/g-atom Young's Modulus of Elasticity 60x106psi
Atomic Volume 8.3W/D Magnetic Susceptibility 0.43x10-6cgs


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