Symmetry elements and Wyckoff positions (interactive)
Ti₂C in Fd-3m
SettingUnit 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
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| C1 | C | 16c | 16 | 0.0000 | 0.0000 | 0.0000 |
| Ti2 | Ti | 32e | 32 | 0.2450 | 0.2450 | 0.2450 |
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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