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Element Details

Element Description

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
Electronegativity 1.6Pauling's
Melting Point 2477°C Covalent Radius 1.34Angstroms
Boiling Point 4927°C Linear Coefficient of Expansion 7.1x10-6K-1
Density 8.57g/cm3 Electrical Resistivity 15.22µΩ-cm
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


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