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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.
|Property Name||Property Value||Property Name||Property Value|
|Atomic Code||(41Nb92.9064)||Atomic Volume||10.8W/D|
|CAS #||7440-03-1||First Ionization Energy||156K-cal/g-mole|
|Melting Point||2477°C||Covalent Radius||1.34Angstroms|
|Boiling Point||4927°C||Linear Coefficient of Expansion||7.1x10-6K-1|
|Themal Conductivity||0.125cal/cm2/cm/s/°C||Crystal Structure||Cubic, body centered|
|Specific Heat @ 25°C||0.065cal/g°C||Thermionic Work Function||4.01eV|
|Heat of Fusion||6.4k-cal/g-atom||Tensile Strength||50,000psi|