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Crystal Lab › Prototype structures › Orthorhombic

TaNiTe₂

Orthorhombic · space group Pmna (No. 53) · Pearson oP16

Symmetry elements and Wyckoff positions (interactive)

TaNiTe₂ in Pmna

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

Unit cell

Lattice constants
a = 7.897 Å, b = 7.228 Å, c = 6.230 Å; α = 90.00°, β = 90.00°, γ = 90.00°
Cell volume
355.6 ų
Atoms in the conventional cell
16 (Ta 4, Te 8, Ni 4)
Formula units Z
4
Pearson symbol
oP16 — orthorhombic, primitive lattice, 16 atoms per conventional cell
Symmetry operations
8 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
Ta2Ta4e40.20490.00000.0000
Te3Te4g40.25000.31930.2500
Ni1Ni4h40.00000.88020.6451
Te4Te4h40.00000.77600.2507

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 16 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

ABC2_oP16_53_h_e_gh-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP16, then the space-group number 53, then the Wyckoff letters occupied by each element in turn (Ta: 4e; Te: 4g; Ni: 4h; Te: 4h). 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 ABC2_oP16_53_h_e_gh-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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