Cr₇Se₈

Unit cell

Lattice constants

a = 12.670 Å, b = 7.370 Å, c = 8.790 Å; α = 90.00°, β = 137.05°, γ = 90.00°

Cell volume

559.3 ų

Atoms in the conventional cell

30 (Cr 14, Se 16)

Formula units Z

2

Pearson symbol

mC30 — monoclinic, base-centred lattice, 30 atoms per conventional cell

Symmetry operations

8 per cell

Crystallographic sites

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 30 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

A7B8_mC30_12_aehi_2ij-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol mC30, then the space-group number 12, then the Wyckoff letters occupied by each element in turn (Cr: 2a; Cr: 4e; Cr: 4h; Cr: 4i; Se: 4i; Se: 4i; Se: 8j). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

Co₇Se₈, Cr₇S₈, Cr₇Te₈ <!--beginning with an

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A7B8_mC30_12_aehi_2ij-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.