 | |
| Identifiers | |
|---|---|
3D model (
JSmol)
|
|
| |
| |
| 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).
| |
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]
Structure
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.
Preparation
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]
- TaI5 (g) + AsI3 (g) ↔ TaAs (s) + 4 I2 (g)
References
- ^ a b c Furuseth, S., Selte, K., Kjekshus, A., Gronowitz, S., Hoffman, R. A., Westerdahl, A. (1965). "On the Arsenides and Antimonides of Tantalum". Acta Chemica Scandinavica. 19: 95–106. doi: 10.3891/acta.chem.scand.19-0095. ISSN 0904-213X.
- ^ a b c Li, Z., Chen, H., Jin, S., Gan, D., Wang, W., Guo, L., Chen, X. (2 March 2016). "Weyl Semimetal TaAs: Crystal Growth, Morphology, and Thermodynamics". Crystal Growth & Design. 16 (3): 1172–1175. doi: 10.1021/acs.cgd.5b01758. ISSN 1528-7505.
- ^ a b Xu, S.-Y., Belopolski, I., Alidoust, N., Neupane, M., Bian, G., Zhang, C., Sankar, R., Chang, G., Yuan, Z., Lee, C.-C., Huang, S.-M., Zheng, H., Ma, J., Sanchez, D. S., Wang, B., Bansil, A., Chou, F., Shibayev, P. P., Lin, H., Jia, S., Hasan, M. Z. (7 August 2015). "Discovery of a Weyl fermion semimetal and topological Fermi arcs". Science. 349 (6248): 613–617. arXiv: 1502.03807. Bibcode: 2015Sci...349..613X. doi: 10.1126/science.aaa9297. ISSN 1095-9203. PMID 26184916. S2CID 206636457.