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