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Niobium ( Nb )

Material Information

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Bolt Foil Insulated Wire Lump Microfoil Nut Powder Rod Single Crystal
Bolt Foil Insulated Wire Lump Microfoil Nut Powder Rod Single Crystal
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Sphere Sputtering Target Tube Washer Wire

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General Description:  

Discovered in 1801 by C. Hatchett in London, England.

Niobium is a silver colored metal which is generally found in conjunction with tantalum, the two elements being separated by fractional crystallization of their respective fluoro-complexes. It has an abundance of 20 ppm in the earth's crust. As a pure metal, is very reactive and forms an extremely stable oxide when exposed to air which enhances its corrosion resistance. Niobium will react with a variety of non-metals at elevated temperatures.

Niobium and its alloys have high melting points and are, therefore, used in high temperature engineering products (for use at temperatures in excess of 1200C). It is also used as an alloying agent for certain steels where it greatly improves the strength of the resulting material. Niobium also finds applications in atomic reactors due to its corrosion resistance and, when combined with either tin (Nb3Sn) or zirconium, it has a high degree of superconductivity.

   

Atomic Properties

Atomic number 41
Atomic radius - Goldschmidt ( nm ) 0.147
Atomic weight ( amu ) 92.9064
Crystal structure Body centred cubic
Electronic structure Kr 4d4 5s1
Ionization potential No. eV
1 6.88
2 14.3
3 25.0
4 38.3
5 50.5
6 103
Natural isotope distribution Mass No. %
93 100
Photo-electric work function ( eV ) 4.3
Thermal neutron absorption cross-section ( Barns ) 1.15
Valences shown 2, 3, 4, 5

Electrical Properties

Electrical resistivity @20C ( µOhmcm ) 16
Temperature coefficient @0-100C ( K-1 ) 0.0026
Superconductivity critical temperature ( K ) 9.25

Mechanical Properties

Material condition Soft Hard Polycrystalline
Bulk modulus ( GPa )     170.3
Hardness - Vickers 115 160
Izod toughness ( J m-1 ) 10-120
Poisson's ratio     0.397
Tensile modulus ( GPa )     104.9
Tensile strength ( MPa ) 330 585
Yield strength ( MPa ) 240 550

Physical Properties

Boiling point ( C ) 4742
Density @20C ( g cm-3 ) 8.57
Melting point ( C ) 2468

Thermal Properties

Coefficient of thermal expansion @0-100C ( x10-6 K-1 ) 7.2
Latent heat of evaporation ( J g-1 ) 7360
Latent heat of fusion ( J g-1 ) 290
Specific heat @25C ( J K-1 kg-1 ) 268
Thermal conductivity @0-100C ( W m-1 K-1 ) 53.7
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Niobium on-line

We stock and supply the following standard forms:
Bolt Foil Insulated Wire Lump Microfoil Nut Powder Rod Single Crystal
Bolt Foil Insulated Wire Lump Microfoil Nut Powder Rod Single Crystal
Sphere Sputtering Target Tube Washer Wire
Sphere Sputtering Target Tube Washer Wire

Choose a form to search our on-line catalog  

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