Tantalum arsenide
Chemical compound From Wikipedia, the free encyclopedia
Chemical compound From Wikipedia, the free encyclopedia
Tantalum arsenide is a compound of tantalum and arsenic with the formula TaAs. It is notable as being the first topological Weyl semimetal that was identified and characterized by ARPES.[3]
Identifiers | |
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3D model (JSmol) |
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Properties | |
TaAs | |
Molar mass | 255.869 g/mol |
Density | 12.25 g/cm3[1] |
Melting point | Decomposes at 1400°C[2] |
Structure | |
Body-centered tetragonal | |
I41md, No. 109 | |
4mm | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tantalum arsenide crystallizes in a body-centered tetragonal unit cell with lattice parameters a = 3.44 Å and c = 11.65 Å. It belongs to the space group I41md.
TaAs has been prepared by decomposing TaAs2 at 900 °C.[1] A more recent preparation yielded large, single crystals of TaAs by chemical vapor transport with elemental precursors and iodine as the transport agent:[2]
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