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Crystal Lab › Prototype structures › Cubic

Ti₂C

Cubic · space group Fd-3m (No. 227) · Pearson cF48

Symmetry elements and Wyckoff positions (interactive)

Ti₂C in Fd-3m

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

Unit cell

Lattice constants
a = 8.600 Å, b = 8.600 Å, c = 8.600 Å; α = 90.00°, β = 90.00°, γ = 90.00°
Cell volume
636.1 ų
Atoms in the conventional cell
48 (C 16, Ti 32)
Formula units Z
16
Pearson symbol
cF48 — cubic, face-centred lattice, 48 atoms per conventional cell
Symmetry operations
192 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
C1C16c160.00000.00000.0000
Ti2Ti32e320.24500.24500.2450

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 48 atoms drawn above are these sites multiplied by all 192 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

AB2_cF48_227_c_e-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol cF48, then the space-group number 227, then the Wyckoff letters occupied by each element in turn (C: 16c; Ti: 32e). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

Ca₃₃Ge, MnBr₂, SnS₂, TiS₂ <!--beginning with an

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry AB2_cF48_227_c_e-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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