Crystal Lab › Prototype structures › Orthorhombic
V₂MoO₈
Orthorhombic · space group Cmm2 (No. 35) · Pearson oC22
Symmetry elements and Wyckoff positions (interactive)
V₂MoO₈ in Cmm2
SettingUnit cell
- Lattice constants
- a = 19.400 Å, b = 3.620 Å, c = 4.130 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 290.0 ų
- Atoms in the conventional cell
- 22 (Mo 2, O 16, V 4)
- Formula units Z
- 2
- Pearson symbol
- oC22 — orthorhombic, base-centred lattice, 22 atoms per conventional cell
- Symmetry operations
- 8 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Mo1 | Mo | 2a | 2 | 0.0000 | 0.0000 | 0.0000 |
| O2 | O | 2a | 2 | 0.0000 | 0.0000 | 0.5838 |
| O3 | O | 2b | 2 | 0.0000 | 0.5000 | 0.9580 |
| O4 | O | 4d | 4 | 0.8110 | 0.0000 | 0.5461 |
| O5 | O | 4d | 4 | 0.9039 | 0.0000 | 0.1220 |
| O6 | O | 4d | 4 | 0.7018 | 0.0000 | 0.1399 |
| V7 | V | 4d | 4 | 0.8134 | 0.0000 | 0.0038 |
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 22 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
AB8C2_oC22_35_a_ab3d_d-002: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oC22, then the space-group number 35, then the Wyckoff letters occupied by each element in turn (Mo: 2a; O: 2a; O: 2b; O: 4d; O: 4d; O: 4d; V: 4d). 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 AB8C2_oC22_35_a_ab3d_d-002 (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.