Tantalum arsenide

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Tantalum arsenide
TaAs Structure.png
  Ta   As
Identifiers
3D model (JSmol)
PubChem CID
  • InChI=1S/As.Ta
    Key: WCMKFCQUZDOHAQ-UHFFFAOYSA-N
  • [As]#[Ta]
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
a = 3.44 Å, c = 11.65 Å [1] [2] [3]
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] It exhibits an analogue of quantum vortices in momentum space. [4]

Contents

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

  1. 1 2 3 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.
  2. 1 2 3 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. Bibcode:2016CrGrD..16.1172L. doi:10.1021/acs.cgd.5b01758. ISSN   1528-7505.
  3. 1 2 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.
  4. ↑ Figgemeier, T.; Ünzelmann, M.; Eck, P.; Schusser, J.; Crippa, L.; Neu, J. N.; Geldiyev, B.; Kagerer, P.; Buck, J.; Kalläne, M.; Hoesch, M.; Rossnagel, K.; Siegrist, T.; Lim, L.-K.; Moessner, R.; Sangiovanni, G.; Di Sante, D.; Reinert, F.; Bentmann, H. (13 February 2025). "Imaging Orbital Vortex Lines in Three-Dimensional Momentum Space". Physical Review X. 15 (1) 011032. arXiv: 2402.10031 . Bibcode:2025PhRvX..15a1032F. doi: 10.1103/PhysRevX.15.011032 . hdl: 11585/1008928 .
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