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Crystal Lab › Prototype structures › Orthorhombic

Al₂₂Mo₅

Orthorhombic · space group Fdd2 (No. 43) · Pearson oF216

Symmetry elements and Wyckoff positions (interactive)

Al₂₂Mo₅ in Fdd2

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

Unit 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

SiteElementWyckoffMultiplicityxyz
Mo12Mo8a80.00000.00000.0000
Al10Al16b160.10450.02150.8132
Al1Al16b160.28670.14420.2510
Al11Al16b160.22220.07390.0963
Al2Al16b160.01880.03940.4980
Al3Al16b160.32440.06730.2430
Al4Al16b160.34140.49590.2510
Al5Al16b160.12220.04310.2920
Al6Al16b160.45280.12720.8278
Al7Al16b160.24130.02230.5775
Al8Al16b160.41620.02520.8431
Al9Al16b160.43580.08250.3263
Mo13Mo16b160.30480.10590.7505
Mo14Mo16b160.14100.03720.7637

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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