Crystal Lab › Prototype structures › Monoclinic
Monoclinic UMo₅O₁₆ Mo₅O₁₆U
Monoclinic · space group P121 (No. 3) · Pearson mP22
Symmetry elements and Wyckoff positions (interactive)
Monoclinic UMo₅O₁₆ in P121
SettingUnit cell
- Lattice constants
- a = 12.253 Å, b = 4.134 Å, c = 7.182 Å; α = 90.00°, β = 126.08°, γ = 90.00°
- Cell volume
- 294.0 ų
- Atoms in the conventional cell
- 22 (Mo 5, O 16, U 1)
- Formula units Z
- 1
- Pearson symbol
- mP22 — monoclinic, primitive lattice, 22 atoms per conventional cell
- Symmetry operations
- 2 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Mo1 | Mo | 1a | 1 | 0.0000 | 0.8919 | 0.0000 |
| O2 | O | 1a | 1 | 0.0000 | 0.4800 | 0.0000 |
| O3 | O | 1b | 1 | 0.0000 | 0.4990 | 0.5000 |
| U4 | U | 1b | 1 | 0.0000 | 0.0000 | 0.5000 |
| Mo5 | Mo | 2e | 2 | 0.3199 | 0.8997 | 0.0688 |
| Mo6 | Mo | 2e | 2 | 0.6802 | 0.0939 | 0.4302 |
| O7 | O | 2e | 2 | 0.1250 | 0.9930 | 0.9240 |
| O8 | O | 2e | 2 | 0.8770 | 0.9930 | 0.6780 |
| O9 | O | 2e | 2 | 0.2500 | 0.0130 | 0.7500 |
| O10 | O | 2e | 2 | 0.3490 | 0.9590 | 0.3470 |
| O11 | O | 2e | 2 | 0.3200 | 0.4860 | 0.0670 |
| O12 | O | 2e | 2 | 0.6860 | 0.4970 | 0.4370 |
| O13 | O | 2e | 2 | 0.5010 | 0.0010 | 0.1920 |
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 2 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
A5B16C_mP22_3_a2e_ab7e_b-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol mP22, then the space-group number 3, then the Wyckoff letters occupied by each element in turn (Mo: 1a; O: 1a; O: 1b; U: 1b; Mo: 2e; Mo: 2e; O: 2e; O: 2e; O: 2e; O: 2e; O: 2e; O: 2e; O: 2e). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Note: monoclinic.
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A5B16C_mP22_3_a2e_ab7e_b-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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