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Ruthenium (44Ru101.07)
[7440-18-8]

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Elemental Form

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.
Melting Point2334°CBoiling Point4150°C
Density12.45g/cm3Specific Heat @ 20°C0.055cal/g°C
Heat of Fusion6.1k-cal/g-atomHeat of Vaporization148k-cal/g-atom
Atomic Volume8.3W/DFirst Ionization Energy173K-cal/g-mole
Electronegativity2.2Pauling'sCovalent Radius1.25Angstroms
Vickers Hardness (annealed)220Linear Coefficient of Expansion9.1x10-6K-1
Electrical Resistivity @ 20°C7.2µΩ-cmCrystal StructureHexagonal
Vapor Pressure @ M.P.9.8mmHgYoung's Modulus of Elasticity60x106psi
Magnetic Susceptibility0.43x10-6cgs