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Crystal Lab › Prototype structures › Orthorhombic

CsFeS₂ (100K)

Orthorhombic · space group Immm (No. 71) · Pearson oI16

Symmetry elements and Wyckoff positions (interactive)

CsFeS₂ (100K) in Immm

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

Unit cell

Lattice constants
a = 11.850 Å, b = 5.420 Å, c = 7.090 Å; α = 90.00°, β = 90.00°, γ = 90.00°
Cell volume
455.4 ų
Atoms in the conventional cell
16 (Cs 4, S 8, Fe 4)
Formula units Z
4
Pearson symbol
oI16 — orthorhombic, body-centred lattice, 16 atoms per conventional cell
Symmetry operations
16 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
Cs1Cs4e40.67000.00000.0000
S4S4f40.85200.50000.0000
Fe2Fe4g40.00000.24900.0000
S3S4i40.00000.00000.7440

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 16 atoms drawn above are these sites multiplied by all 16 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

ABC2_oI16_71_e_g_fi-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oI16, then the space-group number 71, then the Wyckoff letters occupied by each element in turn (Cs: 4e; S: 4f; Fe: 4g; S: 4i). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

RbFeS₂ <!--beginning with an

Note: Stable above 100K.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC2_oI16_71_e_g_fi-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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