Skip to content

Crystal Lab › Prototype structures › Orthorhombic

BaCuSm₂O₅

Orthorhombic · space group Pnma (No. 62) · Pearson oP36

Symmetry elements and Wyckoff positions (interactive)

BaCuSm₂O₅ in Pnma

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

Unit cell

Lattice constants
a = 12.405 Å, b = 5.744 Å, c = 7.283 Å; α = 90.00°, β = 90.00°, γ = 90.00°
Cell volume
519.0 ų
Atoms in the conventional cell
36 (Ba 4, Cu 4, O 20, Sm 8)
Formula units Z
4
Pearson symbol
oP36 — orthorhombic, primitive lattice, 36 atoms per conventional cell
Symmetry operations
8 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
Ba1Ba4c40.59420.25000.5679
Cu2Cu4c40.84080.25000.7868
O3O4c40.40500.25000.4240
Sm6Sm4c40.21100.25000.3854
Sm7Sm4c40.42610.25000.1054
O4O8d80.93700.48900.6680
O5O8d80.72600.00600.8510

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 36 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

ABC5D2_oP36_62_c_c_c2d_2c-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP36, then the space-group number 62, then the Wyckoff letters occupied by each element in turn (Ba: 4c; Cu: 4c; O: 4c; Sm: 4c; Sm: 4c; O: 8d; O: 8d). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

BaCoHo₂O₅, BaCoTb₂O₅, BaCoY₂O₅, BaCoYb₂O₅, BaCuDy₂O₅, BaCuEr₂O₅, BaCuEu₂O₅, BaCuGd₂O₅, BaCuHo₂O₅, BaCuLu₂O₅, BaCuTb₂O₅, BaCuTm₂O₅, BaCuY₂O₅, BaCuYb₂O₅, BaNiLu₂O₅, BaNiTm₂O₅, BaNiYb₂O₅, BaZnDy₂O₅, BaZnEr₂O₅, BaZnEu₂O₅, BaZnGd₂O₅, BaZnHo₂O₅, BaZnSm₂O₅, BaZnTm₂O₅ <!--beginning with an

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC5D2_oP36_62_c_c_c2d_2c-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.

← Garavellite (FeSbBiS₄)  ·  Space group Pnma (113 prototypes)  ·  All prototypes  ·  Warwickite (FeCoBO₄) →