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Tantalum . Ta .

Tantalum  . Ta .Tantalum was discovered in 1802 by A.G Ekeberg in Uppsala, Sweden. Tantalum is a gray, heavy, and very hard metal with platinum-like color when polished. It is malleable, ductile, and can be readily drawn into fine wire with great strength. Tantalum is very resistant to chemical attack and has a high melting point, exceeded only by tungsten and rhenium. Its properties combine well wit other elements to make alloys with great strength, good ductility, and high melting points. Tantalum is used in bone and joint replacement because it is completely immune to body liquids and is nonirritating.

Metal single crystal properties

Statesingle crystal
Crystal structureBody centered cubic
SpacegroupIm3m, cell dimensions/pm [ a=330.29 ]
Production methodElectron beam
Orientationstandard (100), (110), (111) and stepped surfaces like (112) or (115)
Orientation accuracy< 1 degree, < 0.5 degree or ~ 0.1 degree
Sizediameter 5 - 15 mm
Polishingas cut, one or two sides polished
Roughness after polishing~ 0.03 micron
Surface qualityscratch free at 800 times magnification Nomarski interference Zeiss Axiovert 100 microscope
Purity5 N+
Typical analysis (ppm)Al < 1, C 80, Co < 3, Cu < 1, Fe 5, H < 10, N 90, O 120, S < 10, Si 25, Ta balance
X-ray diffractions massCuKa 166 (μ/ρ) / cm2g-1
Absorption coefficientsCuKa 95.4 (μ/ρ) / cm2g-1
Neutron scattering length0.691
Thermal neutron capture cross-section20.6 σa/barns
Density16.6 g/cm3
Melting point2995.85 °C / 3268.85 °K
Boiling point5424.85+/-100 °C / 5697.85 °K
Molar volume10.87 cm3
Thermal conductivity57.5 [ 300 K ] WmK-1
Coefficient of linear thermal expansion6.6 x 10-6 K-1
Electrical resistivity12.45 x 10-8 [ 298 K ] Ωm
Mass magnetic susceptibility+1.07 x 10-8 (s) kg-1m3
Number of isotopes (incl. nuclear isomeres)28
Isotope mass range159 -> 186