Crystal Lab › Prototype structures › Orthorhombic
BaCuSm₂O₅
Orthorhombic · space group Pnma (No. 62) · Pearson oP36
Symmetry elements and Wyckoff positions (interactive)
BaCuSm₂O₅ in Pnma
SettingUnit cell
- Lattice constants
- a = 12.405 Å, b = 5.744 Å, c = 7.283 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 519.0 ų
- Atoms in the conventional cell
- 36 (Ba 4, Cu 4, O 20, Sm 8)
- Formula units Z
- 4
- Pearson symbol
- oP36 — orthorhombic, primitive lattice, 36 atoms per conventional cell
- Symmetry operations
- 8 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Ba1 | Ba | 4c | 4 | 0.5942 | 0.2500 | 0.5679 |
| Cu2 | Cu | 4c | 4 | 0.8408 | 0.2500 | 0.7868 |
| O3 | O | 4c | 4 | 0.4050 | 0.2500 | 0.4240 |
| Sm6 | Sm | 4c | 4 | 0.2110 | 0.2500 | 0.3854 |
| Sm7 | Sm | 4c | 4 | 0.4261 | 0.2500 | 0.1054 |
| O4 | O | 8d | 8 | 0.9370 | 0.4890 | 0.6680 |
| O5 | O | 8d | 8 | 0.7260 | 0.0060 | 0.8510 |
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 36 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
ABC5D2_oP36_62_c_c_c2d_2c-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP36, then the space-group number 62, then the Wyckoff letters occupied by each element in turn (Ba: 4c; Cu: 4c; O: 4c; Sm: 4c; Sm: 4c; O: 8d; O: 8d). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Other compounds with this structure
BaCoHo₂O₅, BaCoTb₂O₅, BaCoY₂O₅, BaCoYb₂O₅, BaCuDy₂O₅, BaCuEr₂O₅, BaCuEu₂O₅, BaCuGd₂O₅, BaCuHo₂O₅, BaCuLu₂O₅, BaCuTb₂O₅, BaCuTm₂O₅, BaCuY₂O₅, BaCuYb₂O₅, BaNiLu₂O₅, BaNiTm₂O₅, BaNiYb₂O₅, BaZnDy₂O₅, BaZnEr₂O₅, BaZnEu₂O₅, BaZnGd₂O₅, BaZnHo₂O₅, BaZnSm₂O₅, BaZnTm₂O₅ <!--beginning with an
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC5D2_oP36_62_c_c_c2d_2c-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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