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Crystal Lab › Prototype structures › Orthorhombic

Nb₂Zr₆O₁₇

Orthorhombic · space group Ima2 (No. 46) · Pearson oI100

Symmetry elements and Wyckoff positions (interactive)

Nb₂Zr₆O₁₇ in Ima2

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

Unit cell

Lattice constants
a = 40.920 Å, b = 4.930 Å, c = 5.270 Å; α = 90.00°, β = 90.00°, γ = 90.00°
Cell volume
1063.1 ų
Atoms in the conventional cell
100 (Nb 8, O 68, Zr 24)
Formula units Z
4
Pearson symbol
oI100 — orthorhombic, body-centred lattice, 100 atoms per conventional cell
Symmetry operations
8 per cell

Crystallographic sites

SiteElementWyckoffMultiplicityxyz
Nb1Nb4a40.00000.00000.0000
Nb2Nb4b40.25000.51510.5087
O3O4b40.25000.35640.1537
O10O8c80.52490.79730.6839
O11O8c80.64190.84210.6826
O4O8c80.69760.84850.9426
O5O8c80.71950.30820.8110
O6O8c80.65890.29250.8251
O7O8c80.59560.29150.7785
O8O8c80.53620.25050.8797
O9O8c80.58270.79940.9251
Zr12Zr8c80.56500.48480.0894
Zr13Zr8c80.62780.01380.0136
Zr14Zr8c80.68960.48490.0861

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 100 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

A2B17C6_oI100_46_ab_b8c_3c-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oI100, then the space-group number 46, then the Wyckoff letters occupied by each element in turn (Nb: 4a; Nb: 4b; O: 4b; O: 8c; O: 8c; O: 8c; O: 8c; O: 8c; O: 8c; O: 8c; O: 8c; Zr: 8c; Zr: 8c; Zr: 8c). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

Nb₂Hf₆O₁₇, Nb₂Zr₆O₁₇, Ta₂Hf₆O₁₇, Ta₂Zr₆O₁₇ <!--beginning with an

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A2B17C6_oI100_46_ab_b8c_3c-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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