Crystal Lab › Prototype structures › Orthorhombic
Rb₂P₃
Orthorhombic · space group Fmmm (No. 69) · Pearson oF40
Symmetry elements and Wyckoff positions (interactive)
Rb₂P₃ in Fmmm
SettingUnit cell
- Lattice constants
- a = 9.641 Å, b = 14.629 Å, c = 9.010 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 1270.8 ų
- Atoms in the conventional cell
- 40 (Rb 16, P 24)
- Formula units Z
- 8
- Pearson symbol
- oF40 — orthorhombic, face-centred lattice, 40 atoms per conventional cell
- Symmetry operations
- 32 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Rb3 | Rb | 8f | 8 | 0.2500 | 0.2500 | 0.2500 |
| Rb4 | Rb | 8g | 8 | 0.2820 | 0.0000 | 0.0000 |
| P1 | P | 8h | 8 | 0.0000 | 0.1481 | 0.0000 |
| P2 | P | 16m | 16 | 0.0000 | 0.0735 | 0.2068 |
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 40 atoms drawn above are these sites multiplied by all 32 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
A3B2_oF40_69_hm_fg-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oF40, then the space-group number 69, then the Wyckoff letters occupied by each element in turn (Rb: 8f; Rb: 8g; P: 8h; P: 16m). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Other compounds with this structure
Cs₂P₃ <!--beginning with an
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A3B2_oF40_69_hm_fg-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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