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Crystal Lab › Prototype structures › Orthorhombic

Rb₂P₃

Orthorhombic · space group Fmmm (No. 69) · Pearson oF40

Symmetry elements and Wyckoff positions (interactive)

Rb₂P₃ in Fmmm

Setting
Loading the group…
x = 0.10, y = 0.17, z = 0.08

Unit 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

SiteElementWyckoffMultiplicityxyz
Rb3Rb8f80.25000.25000.2500
Rb4Rb8g80.28200.00000.0000
P1P8h80.00000.14810.0000
P2P16m160.00000.07350.2068

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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