Crystal Lab › Prototype structures › Orthorhombic
Li₂CdSiO₄
Orthorhombic · space group Pnma (No. 62) · Pearson oP32
Symmetry elements and Wyckoff positions (interactive)
Li₂CdSiO₄ in Pnma
SettingUnit cell
- Lattice constants
- a = 10.715 Å, b = 6.479 Å, c = 5.119 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 355.4 ų
- Atoms in the conventional cell
- 32 (Cd 4, O 16, Si 4, Li 8)
- Formula units Z
- 4
- Pearson symbol
- oP32 — orthorhombic, primitive lattice, 32 atoms per conventional cell
- Symmetry operations
- 8 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Cd1 | Cd | 4c | 4 | 0.3373 | 0.2500 | 0.3255 |
| O3 | O | 4c | 4 | 0.1465 | 0.2500 | 0.1495 |
| O4 | O | 4c | 4 | 0.3071 | 0.2500 | 0.7549 |
| Si6 | Si | 4c | 4 | 0.1573 | 0.2500 | 0.8324 |
| Li2 | Li | 8d | 8 | 0.4100 | 0.5010 | 0.8270 |
| O5 | O | 8d | 8 | 0.5896 | 0.0466 | 0.7890 |
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 32 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
AB2C4D_oP32_62_c_d_2cd_c-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP32, then the space-group number 62, then the Wyckoff letters occupied by each element in turn (Cd: 4c; O: 4c; O: 4c; Si: 4c; Li: 8d; O: 8d). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Other compounds with this structure
Li₂CdPO₄, Li₂CoSiO₄, Li₂FeSiO₄, Li₂MnSiO₄, Li₂CdSiO₄, γ-Li₃PO₄ <!--beginning with an
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry AB2C4D_oP32_62_c_d_2cd_c-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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