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Crystal Lab › Prototype structures › Monoclinic

CrPS₄

Monoclinic · space group C121 (No. 5) · Pearson mC24

Symmetry elements and Wyckoff positions (interactive)

CrPS₄ in C121

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

Unit cell

Lattice constants
a = 10.871 Å, b = 7.254 Å, c = 12.659 Å; α = 90.00°, β = 151.00°, γ = 90.00°
Cell volume
483.9 ų
Atoms in the conventional cell
24 (Cr 4, P 4, S 16)
Formula units Z
4
Pearson symbol
mC24 — monoclinic, base-centred lattice, 24 atoms per conventional cell
Symmetry operations
4 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
Cr1Cr2a20.00000.00000.0000
Cr2Cr2a20.00000.50950.0000
P3P4c40.46260.25880.1655
S4S4c40.83420.99160.7007
S5S4c40.33400.02480.6993
S6S4c40.79960.75940.1934
S7S4c40.77550.25750.1452

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 4 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

ABC4_mC24_5_2a_c_4c-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol mC24, then the space-group number 5, then the Wyckoff letters occupied by each element in turn (Cr: 2a; Cr: 2a; P: 4c; S: 4c; S: 4c; S: 4c; S: 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 ABC4_mC24_5_2a_c_4c-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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