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Tantalum ( Ta )

Material Information

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Bolt Foil Lump Mesh Microfoil Nut Powder Rod Single Crystal
Bolt Foil Lump Mesh Microfoil Nut Powder Rod Single Crystal
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General Description:  

Tantalum was discovered in 1802 by A.G. Ekeberg in Uppsala, Sweden.

Tantalum is a shiny, silvery colored metal which is heavy, dense, malleable and ductile when pure. It is found in small quantities in minerals (generally in conjunction with niobium), and is isolated by conversion to the oxide and then the fluoro-complex, K2TaF7, from which the pure metal is obtained by electrolysis. Tantalum is extremely corrosion resistant due to the formation of an oxide film, and is also resistant to acid attack (with the exception of HF). It will react with fused alkalis and a variety of non-metals at elevated temperatures.

Tantalum can be used as a replacement for platinum for laboratory apparatus which has to have good corrosion resistance, and the metal is also used within the chemical industry for similar reasons. The fluids in the human body do not react with the metal and, hence, it is used for surgical implants without rejection. Other applications include the use of tantalum carbide in cemented carbides which are used as cutting tools. The pure metal is used in the electronics industry in the manufacture of various types of electronic equipment (e.g. rectifiers, capacitors, lamp filaments, etc.). Tantalum is also used in vacuum systems as it has a high absorption rate for residual gases. It is also used as an alloying element with, for example, nickel and molybdenum, to produce alloys which have good corrosion resistance, strength and ductility.

   

Atomic Properties

Atomic number 73
Atomic radius - Goldschmidt ( nm ) 0.147
Atomic weight ( amu ) 180.9479
Crystal structure Body centred cubic
Electronic structure Xe 4f14 5d3 6s2
Ionization potential No. eV
1 7.88
2 16.2
Natural isotope distribution Mass No. %
180 0.012
181 99.988
Photo-electric work function ( eV ) 4.1
Thermal neutron absorption cross-section ( Barns ) 22
Valences shown 2, 3, 4, 5

Electrical Properties

Electrical resistivity @20C ( µOhmcm ) 13.5
Temperature coefficient @0-100C ( K-1 ) 0.0035
Superconductivity critical temperature ( K ) 4.47
Thermal emf against Pt (cold 0C - hot 100C) ( mV ) +0.33

Mechanical Properties

Material condition Soft Hard Polycrystalline
Bulk modulus ( GPa )     196.3
Hardness - Vickers 90 200
Poisson's ratio     0.342
Tensile modulus ( GPa )     185.7
Tensile strength ( MPa ) 172-207 760
Yield strength ( MPa ) 310-380 705

Physical Properties

Boiling point ( C ) 5425
Density @20C ( g cm-3 ) 16.6
Melting point ( C ) 2996

Thermal Properties

Coefficient of thermal expansion @0-100C ( x10-6 K-1 ) 6.5
Latent heat of evaporation ( J g-1 ) 4165
Latent heat of fusion ( J g-1 ) 174
Specific heat @25C ( J K-1 kg-1 ) 140
Thermal conductivity @0-100C ( W m-1 K-1 ) 57.5
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 Tantalum on-line

We stock and supply the following standard forms:
Bolt Foil Lump Mesh Microfoil Nut Powder Rod Single Crystal
Bolt Foil Lump Mesh 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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