Niobium

Niobium: physical properties

Temperatures

• Melting point: 2750 [or 2477 °C (4491 °F)] K
• Boiling point: 5017 [or 4744 °C (8571 °F)] K (liquid range: 2267  K
• Critical temperature: no data  K
• Superconduction temperature: 9.25 [or -263.9 °C (-443 °F)] K

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Expansion and conduction properties

• Thermal conductivity: 54  W m^-1 K^-1
• Coefficient of linear thermal expansion: 7.3  x 10^-6 K^-1

Bulk properties

• Density of solid: 8570  kg m^-3
• Molar volume: 10.83  cm³
• Velocity of sound: 3480  m s^-1

Elastic properties

• Youngs modulus: 105  GPa
• Rigidity modulus: 38  GPa
• Bulk modulus: 170  GPa
• Poissons ratio: 0.40  (no units)

Hardnesses

• Mineral hardness: 6.0  (no units)
• Brinell hardness: 736  MN m^-2
• Vickers hardness: 1320  MN m^-2

Electrical properties

• Electrical resistivity: 15  10^-8 Ω m; or mΩ cm

Optical properties

The image above is a virtual representation of niobium metal calculated by Patrick Callet using the complex diectric function of the element only.

• Reflectivity: no data  %
• Refractive index: no data  (no units)

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Niobium	Niobium
Niob	Niobium
Niobio	Niobio
Niob	Nióbio