Crystal Lab › Prototype structures › Orthorhombic
α-SnWO₄ O₄SnW
Orthorhombic · space group Pnna (No. 52) · Pearson oP24
Symmetry elements and Wyckoff positions (interactive)
α-SnWO₄ in Pnna
SettingUnit cell
- Lattice constants
- a = 5.627 Å, b = 11.649 Å, c = 4.997 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 327.6 ų
- Atoms in the conventional cell
- 24 (Sn 4, W 4, O 16)
- Formula units Z
- 4
- Pearson symbol
- oP24 — orthorhombic, primitive lattice, 24 atoms per conventional cell
- Symmetry operations
- 8 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Sn1 | Sn | 4c | 4 | 0.2500 | 0.0000 | 0.2196 |
| W2 | W | 4d | 4 | 0.6677 | 0.2500 | 0.2500 |
| O3 | O | 8e | 8 | 0.3765 | 0.2987 | 0.9988 |
| O4 | O | 8e | 8 | 0.1019 | 0.3961 | 0.6037 |
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 24 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
A4BC_oP24_52_2e_c_d-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP24, then the space-group number 52, then the Wyckoff letters occupied by each element in turn (Sn: 4c; W: 4d; O: 8e; O: 8e). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Note: α-SnWO₄.
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A4BC_oP24_52_2e_c_d-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.