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IRIDIUM (77Ir192.22)

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Iridium, a precious metal, has an appearance similar to platinum in that it is white, but with a slightly yellowish tint. It is the most corrosion-resistant metal known, is very hard, brittle, and has a low ductility, making it difficult to machine, form, or work. Its principle use is as a hardening agent for platinum, though it is frequently found in crucibles and other high temperature devices.

Property Name Property Value Property Name Property Value
Atomic Code (77Ir192.22) First Ionization Energy 212K-cal/g-mole
CAS # 7439-88-5 Electronegativity 2.2Pauling's
Covalent Radius 1.27Angstroms
Melting Point 2450°C Vickers Hardness (annealed) 500
Boiling Point 4428°C Linear Coefficient of Expansion 6.8x10-6K-1
Density 22.65g/cm3 Electrical Resistivity @ 20°C 5.11µΩ-cm
Themal Conductivity 0.14cal/cm2/cm/s/°C Crystal Structure Cubic, face centered
Specific Heat @ 0°C 0.031cal/g°C Vapor Pressure @ M.P. 3.5mmHg
Heat of Fusion 6.6k-cal/g-atom Young's Modulus of Elasticity 76x106psi
Heat of Vaporization 152k-cal/g-atom Magnetic Susceptibility 6.6x10-6cgs
Atomic Volume 8.54W/D Tensile Strength (annealed) 160,000psi


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