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Niobium (41Nb92.9064)
[7440-03-1]
[7440-03-1]
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Elemental Form| Though most metallurgists refer to the metal as "columbium", the name "niobium" was officially adopted by chemical authorities by chemical authorities in 1950 after 100 years of controversy. Niobium is steel-gray or silvery-white, but takes on a bluish tint when exposed to air at room temperatures for extended periods. The metal's oxidation in air commences at 200°C. Niobium, when used in alloying, improves strength, and its superconductive properties are enhanced when combined with zirconium. | ||||
| Melting Point | 2477°C | Boiling Point | 4927°C | |
| Density | 8.57g/cm3 | Themal Conductivity | 0.125cal/cm2/cm/s/°C | |
| Specific Heat @ 25°C | 0.065cal/g°C | Heat of Fusion | 6.4k-cal/g-atom | |
| Atomic Volume | 10.8W/D | First Ionization Energy | 156K-cal/g-mole | |
| Electronegativity | 1.6Pauling's | Covalent Radius | 1.34Angstroms | |
| Linear Coefficient of Expansion | 7.1x10-6K-1 | Electrical Resistivity | 15.22µΩ-cm | |
| Crystal Structure | Cubic, body centered | Thermionic Work Function | 4.01eV | |
| Tensile Strength | 50,000psi | |||
