Crystal Lab › Prototype structures › Orthorhombic
Al₂₂Mo₅
Orthorhombic · space group Fdd2 (No. 43) · Pearson oF216
Symmetry elements and Wyckoff positions (interactive)
Al₂₂Mo₅ in Fdd2
SettingUnit cell
- Lattice constants
- a = 73.820 Å, b = 9.161 Å, c = 4.933 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 3336.0 ų
- Atoms in the conventional cell
- 216 (Mo 40, Al 176)
- Formula units Z
- 8
- Pearson symbol
- oF216 — orthorhombic, face-centred lattice, 216 atoms per conventional cell
- Symmetry operations
- 16 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Mo12 | Mo | 8a | 8 | 0.0000 | 0.0000 | 0.0000 |
| Al10 | Al | 16b | 16 | 0.1045 | 0.0215 | 0.8132 |
| Al1 | Al | 16b | 16 | 0.2867 | 0.1442 | 0.2510 |
| Al11 | Al | 16b | 16 | 0.2222 | 0.0739 | 0.0963 |
| Al2 | Al | 16b | 16 | 0.0188 | 0.0394 | 0.4980 |
| Al3 | Al | 16b | 16 | 0.3244 | 0.0673 | 0.2430 |
| Al4 | Al | 16b | 16 | 0.3414 | 0.4959 | 0.2510 |
| Al5 | Al | 16b | 16 | 0.1222 | 0.0431 | 0.2920 |
| Al6 | Al | 16b | 16 | 0.4528 | 0.1272 | 0.8278 |
| Al7 | Al | 16b | 16 | 0.2413 | 0.0223 | 0.5775 |
| Al8 | Al | 16b | 16 | 0.4162 | 0.0252 | 0.8431 |
| Al9 | Al | 16b | 16 | 0.4358 | 0.0825 | 0.3263 |
| Mo13 | Mo | 16b | 16 | 0.3048 | 0.1059 | 0.7505 |
| Mo14 | Mo | 16b | 16 | 0.1410 | 0.0372 | 0.7637 |
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 216 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
A22B5_oF216_43_11b_a2b-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oF216, then the space-group number 43, then the Wyckoff letters occupied by each element in turn (Mo: 8a; Al: 16b; Al: 16b; Al: 16b; Al: 16b; Al: 16b; Al: 16b; Al: 16b; Al: 16b; Al: 16b; Al: 16b; Al: 16b; Mo: 16b; Mo: 16b). 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 A22B5_oF216_43_11b_a2b-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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