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Crystal Lab › Prototype structures › Orthorhombic

NiNbTe₂

Orthorhombic · space group Pma2 (No. 28) · Pearson oP16

Symmetry elements and Wyckoff positions (interactive)

NiNbTe₂ in Pma2

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

Unit cell

Lattice constants
a = 7.955 Å, b = 6.258 Å, c = 7.203 Å; α = 90.00°, β = 90.00°, γ = 90.00°
Cell volume
358.6 ų
Atoms in the conventional cell
16 (Te 8, Ni 4, Nb 4)
Formula units Z
4
Pearson symbol
oP16 — orthorhombic, primitive lattice, 16 atoms per conventional cell
Symmetry operations
4 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
Te1Te2a20.00000.00000.1398
Te2Te2b20.00000.50000.7841
Ni5Ni2c20.25000.59500.5810
Ni6Ni2c20.25000.88930.3380
Te3Te2c20.25000.50180.2360
Te4Te2c20.25000.00070.6840
Nb7Nb4d40.54570.75720.4690

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 4 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_28_d_2c_ab2c-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 28, then the Wyckoff letters occupied by each element in turn (Te: 2a; Te: 2b; Ni: 2c; Ni: 2c; Te: 2c; Te: 2c; Nb: 4d). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

NiTaTe₂ <!--beginning with an

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC2_oP16_28_d_2c_ab2c-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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