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Crystal Lab › Prototype structures › Orthorhombic

Cs₂Sb

Orthorhombic · space group Pnma (No. 62) · Pearson oP24

Symmetry elements and Wyckoff positions (interactive)

Cs₂Sb in Pnma

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

Unit cell

Lattice constants
a = 15.985 Å, b = 6.319 Å, c = 10.995 Å; α = 90.00°, β = 90.00°, γ = 90.00°
Cell volume
1110.6 ų
Atoms in the conventional cell
24 (Cs 16, Sb 8)
Formula units Z
8
Pearson symbol
oP24 — orthorhombic, primitive lattice, 24 atoms per conventional cell
Symmetry operations
8 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
Cs1Cs4c40.00060.25000.6743
Cs2Cs4c40.20440.25000.4059
Cs3Cs4c40.25610.25000.7398
Cs4Cs4c40.43930.25000.4136
Sb5Sb4c40.16180.25000.0629
Sb6Sb4c40.34360.25000.0916

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

A2B_oP24_62_4c_2c-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 62, then the Wyckoff letters occupied by each element in turn (Cs: 4c; Cs: 4c; Cs: 4c; Cs: 4c; Sb: 4c; Sb: 4c). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A2B_oP24_62_4c_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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