Crystal Lab › Prototype structures › Trigonal
BaMo₆S₈
Trigonal · space group R-3 (No. 148) · Pearson hR15
Symmetry elements and Wyckoff positions (interactive)
BaMo₆S₈ in R-3
SettingUnit cell
- Lattice constants
- a = 9.277 Å, b = 9.277 Å, c = 11.793 Å; α = 90.00°, β = 90.00°, γ = 120.00°
- Cell volume
- 879.1 ų
- Atoms in the conventional cell
- 45 (Ba 3, S 24, Mo 18)
- Formula units Z
- 3
- Pearson symbol
- hR15 — hexagonal / trigonal, rhombohedral lattice, 15 atoms per conventional cell
- Symmetry operations
- 18 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Ba1 | Ba | 3a | 3 | 0.0000 | 0.0000 | 0.0000 |
| S3 | S | 6c | 6 | 0.0000 | 0.0000 | 0.2512 |
| Mo2 | Mo | 18f | 18 | 0.1599 | 0.1712 | 0.4060 |
| S4 | S | 18f | 18 | 0.9739 | 0.2935 | 0.4168 |
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 45 atoms drawn above are these sites multiplied by all 18 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
AB6C8_hR15_148_a_f_cf-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol hR15, then the space-group number 148, then the Wyckoff letters occupied by each element in turn (Ba: 3a; S: 6c; Mo: 18f; S: 18f). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Other compounds with this structure
CaMo₆S₈, CeMo₆S₈, CeMo₆Se₈, EuMo₆S₈, LaMo₆S₈, LaMo₆Se₈, NdMo₆S₈, NdMo₆Se₈, PbMo₆S₈, PrMo₆S₈, PrMo₆Se₈, SmMo₆S₈, SmMo₆Se₈, SrMo₆S₈ <!--beginning with an
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry AB6C8_hR15_148_a_f_cf-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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