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Crystal Lab › Prototype structures › Orthorhombic

β-NbPd₃

Orthorhombic · space group Pmmn (No. 59) · Pearson oP24

Symmetry elements and Wyckoff positions (interactive)

β-NbPd₃ in Pmmn

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

Unit cell

Lattice constants
a = 5.486 Å, b = 13.600 Å, c = 4.845 Å; α = 90.00°, β = 90.00°, γ = 90.00°
Cell volume
361.5 ų
Atoms in the conventional cell
24 (Nb 6, Pd 18)
Formula units Z
6
Pearson symbol
oP24 — orthorhombic, primitive lattice, 24 atoms per conventional cell
Symmetry operations
8 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
Nb1Nb2a20.25000.25000.0000
Pd3Pd2b20.25000.75000.0000
Nb2Nb4e40.25000.91670.6667
Pd4Pd4e40.25000.08330.3333
Pd5Pd4f40.00000.25000.5000
Pd6Pd8g80.00000.91670.1667

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 24 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

AB3_oP24_59_ae_befg-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP24, then the space-group number 59, then the Wyckoff letters occupied by each element in turn (Nb: 2a; Pd: 2b; Nb: 4e; Pd: 4e; Pd: 4f; Pd: 8g). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Note: \beta-NbPd₃.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry AB3_oP24_59_ae_befg-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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