Crystal Lab › Prototype structures › Tetragonal
InPS₄
Tetragonal · space group I-4 (No. 82) · Pearson tI12
Symmetry elements and Wyckoff positions (interactive)
InPS₄ in I-4
SettingUnit cell
- Lattice constants
- a = 5.600 Å, b = 5.600 Å, c = 9.020 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 282.9 ų
- Atoms in the conventional cell
- 12 (In 2, P 2, S 8)
- Formula units Z
- 2
- Pearson symbol
- tI12 — tetragonal, body-centred lattice, 12 atoms per conventional cell
- Symmetry operations
- 8 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| In1 | In | 2a | 2 | 0.0000 | 0.0000 | 0.0000 |
| P2 | P | 2c | 2 | 0.0000 | 0.5000 | 0.2500 |
| S3 | S | 8g | 8 | 0.2330 | 0.6920 | 0.8690 |
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 12 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
ABC4_tI12_82_a_c_g-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol tI12, then the space-group number 82, then the Wyckoff letters occupied by each element in turn (In: 2a; P: 2c; S: 8g). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Other compounds with this structure
AlPO₄ <!--beginning with an
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC4_tI12_82_a_c_g-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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