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Crystal Lab › Prototype structures › Trigonal

RbAg₂SbS₄

Trigonal · space group P3221 (No. 154) · Pearson hP24

Symmetry elements and Wyckoff positions (interactive)

RbAg₂SbS₄ in P3221

Setting
Loading the group…
x = 0.10, y = 0.17, z = 0.08

Unit 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

SiteElementWyckoffMultiplicityxyz
Rb2Rb3a30.55700.00000.6667
Sb5Sb3b30.72180.00000.1667
Ag1Ag6c60.09790.71720.0962
S3S6c60.50660.98020.0533
S4S6c60.75980.66740.1746

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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