Crystal Lab › Prototype structures › Orthorhombic
TaNiTe₂
Orthorhombic · space group Pmna (No. 53) · Pearson oP16
Symmetry elements and Wyckoff positions (interactive)
TaNiTe₂ in Pmna
SettingUnit cell
- Lattice constants
- a = 7.897 Å, b = 7.228 Å, c = 6.230 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 355.6 ų
- Atoms in the conventional cell
- 16 (Ta 4, Te 8, Ni 4)
- Formula units Z
- 4
- Pearson symbol
- oP16 — orthorhombic, primitive lattice, 16 atoms per conventional cell
- Symmetry operations
- 8 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Ta2 | Ta | 4e | 4 | 0.2049 | 0.0000 | 0.0000 |
| Te3 | Te | 4g | 4 | 0.2500 | 0.3193 | 0.2500 |
| Ni1 | Ni | 4h | 4 | 0.0000 | 0.8802 | 0.6451 |
| Te4 | Te | 4h | 4 | 0.0000 | 0.7760 | 0.2507 |
The multiplicity and the Wyckoff letter say how many copies of the site the group makes in one cell and on which kind of symmetry element the site sits; the 16 atoms drawn above are these sites multiplied by all 8 operations. Press Wyckoff under Colour to see the sites, and tick a symmetry element on the left to see which atoms lie on it.
How to read the label
ABC2_oP16_53_h_e_gh-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP16, then the space-group number 53, then the Wyckoff letters occupied by each element in turn (Ta: 4e; Te: 4g; Ni: 4h; Te: 4h). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC2_oP16_53_h_e_gh-001 (M. J. Mehl et al., Comput. Mater. Sci. 136, S1 (2017); D. Hicks et al., ibid. 161, S1 (2019) and 199, 110450 (2021); S. Eckert et al., ibid. 240, 112988 (2024)). Symmetry elements, Wyckoff assignment and the diagram are computed on this page from the group operations.
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