Crystal Lab › Prototype structures › Orthorhombic
NiNbTe₂
Orthorhombic · space group Pma2 (No. 28) · Pearson oP16
Symmetry elements and Wyckoff positions (interactive)
NiNbTe₂ in Pma2
SettingUnit cell
- Lattice constants
- a = 7.955 Å, b = 6.258 Å, c = 7.203 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 358.6 ų
- Atoms in the conventional cell
- 16 (Te 8, Ni 4, Nb 4)
- Formula units Z
- 4
- Pearson symbol
- oP16 — orthorhombic, primitive lattice, 16 atoms per conventional cell
- Symmetry operations
- 4 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Te1 | Te | 2a | 2 | 0.0000 | 0.0000 | 0.1398 |
| Te2 | Te | 2b | 2 | 0.0000 | 0.5000 | 0.7841 |
| Ni5 | Ni | 2c | 2 | 0.2500 | 0.5950 | 0.5810 |
| Ni6 | Ni | 2c | 2 | 0.2500 | 0.8893 | 0.3380 |
| Te3 | Te | 2c | 2 | 0.2500 | 0.5018 | 0.2360 |
| Te4 | Te | 2c | 2 | 0.2500 | 0.0007 | 0.6840 |
| Nb7 | Nb | 4d | 4 | 0.5457 | 0.7572 | 0.4690 |
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 4 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_28_d_2c_ab2c-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 28, then the Wyckoff letters occupied by each element in turn (Te: 2a; Te: 2b; Ni: 2c; Ni: 2c; Te: 2c; Te: 2c; Nb: 4d). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Other compounds with this structure
NiTaTe₂ <!--beginning with an
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC2_oP16_28_d_2c_ab2c-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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