Pure Niobium (Nb)



Niobium is resistant against many chemicals and can be easily formed even at low temperatures. Additionally, this high level of resistance is achieved at a relatively low weight.



Sound speed, longitudinal clong

4900 m/s at 20 °C

Sound speed, transversal ctrans

2100 m/s at 20 °C


Electrical conductivity σel

7.00E+6 S/m at 20 °C

Electrical resistivity ρel

1.4E-7 Ω·m at 20 °C

Electron work function We

4.3 eV at 20 °C

Superconductive transition temperature Tsuper

-263.95 °C


Density ρ

8.57 g/cm³ at 20 °C

Molar mass M

92.91 g/mol

Neutron capture cross-section σN

0 m² at 20 °C


Elastic modulus E

104 GPa at 20 °C

Hardness, Vickers, 10 HV 10

60 - 110 [-] at 20 °C


Poisson's ratio ν

0.35 [-] at 20 °C


Boiling point Tb

4744 °C

Coefficient of thermal expansion α

7.1E-6 1/K at 20 °C

Crystallization temperature Tx

850 - 1300 °C

annealing time: 1 hour

Melting point Tm

2468 °C

Specific heat capacity cp

270 J/(kg·K) at 20 °C

Thermal conductivity λ

52 W/(m·K) at 20 °C

Technological properties

Application areas

This material can be used to manufacture coin inserts of all colors, corrosion-resistant evaporation boats for use in coating technology, and dimensionally stable crucibles for diamond growth. Thanks to its high level of biocompatibility, niobium is also used as a material for implants. Thanks to its high transition temperature, niobium is the perfect material for superconducting cables and magnets.

This material data has been provided by Plansee.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.