Crystal Lab › Prototype structures › Trigonal
RbAg₂SbS₄
Trigonal · space group P3221 (No. 154) · Pearson hP24
Symmetry elements and Wyckoff positions (interactive)
RbAg₂SbS₄ in P3221
SettingUnit cell
- Lattice constants
- a = 6.630 Å, b = 6.630 Å, c = 16.700 Å; α = 90.00°, β = 90.00°, γ = 120.00°
- Cell volume
- 635.7 ų
- Atoms in the conventional cell
- 24 (Rb 3, Sb 3, Ag 6, S 12)
- Formula units Z
- 3
- Pearson symbol
- hP24 — hexagonal / trigonal, primitive lattice, 24 atoms per conventional cell
- Symmetry operations
- 6 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Rb2 | Rb | 3a | 3 | 0.5570 | 0.0000 | 0.6667 |
| Sb5 | Sb | 3b | 3 | 0.7218 | 0.0000 | 0.1667 |
| Ag1 | Ag | 6c | 6 | 0.0979 | 0.7172 | 0.0962 |
| S3 | S | 6c | 6 | 0.5066 | 0.9802 | 0.0533 |
| S4 | S | 6c | 6 | 0.7598 | 0.6674 | 0.1746 |
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 6 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
A2BC4D_hP24_154_c_a_2c_b-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol hP24, then the space-group number 154, then the Wyckoff letters occupied by each element in turn (Rb: 3a; Sb: 3b; Ag: 6c; S: 6c; S: 6c). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Other compounds with this structure
BaCu₂GeSe₄, BaGa₂GeS₄, EuLi₂SiO₄, PbCu₂SiS₄, SrCu₂GeS₄, SrLi₂SiO₄ <!--beginning with an
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A2BC4D_hP24_154_c_a_2c_b-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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