Pyrochlore Iridate (Eu₂Ir₂O₇, E8₁)

Unit cell

Lattice constants

a = 10.266 Å, b = 10.266 Å, c = 10.266 Å; α = 90.00°, β = 90.00°, γ = 90.00°

Cell volume

1082.0 ų

Atoms in the conventional cell

88 (O 56, Eu 16, Ir 16)

Formula units Z

8

Pearson symbol

cF88 — cubic, face-centred lattice, 88 atoms per conventional cell

Symmetry operations

192 per cell

Crystallographic sites

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 88 atoms drawn above are these sites multiplied by all 192 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

A2B2C7_cF88_227_c_d_af-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol cF88, then the space-group number 227, then the Wyckoff letters occupied by each element in turn (O: 8a; Eu: 16c; Ir: 16d; O: 48f). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

Am₂Zr₂O₇, Bi₂Hf₂O₇, Bi₂InNbO₇, Bi₂InTaO₇, Bi₂Ir₂O₇, Bi₂LaTaO₇, Bi₂Pt₂O₇, Bi₂Ru₂O₇, Bi₂Sn₂O₇, Bi₂Ti₂O₇, Bi₂YTaO₇, Ca₂Bi₂O₇, Ca₂Nb₂O₇, Ca₂Ru₂O₇, Ca₂Ta₂O₇, Ca₂Ta₂O6F, Cd₂Nb₂O₇, Cd₂Os₂O₇, Cd₂Re₂O₇, Cd₂Ru₂O₇, Cd₂Sb₂O₇, Cd₂Ta₂O₇, Cd₂Tc₂O₇, Ce₂Sn₂O₇, Ce₂Zr₂O₇, Co₂Sb₂O₇, Dy₂CrSbO₇, Dy₂GaSbO₇, Dy₂Ge₂O₇, Dy₂Hf₂O₇, Dy₂Mo₂O₇, Dy₂Ru₂O₇, Dy₂Sn₂O₇, Dy₂Tc₂O₇, Dy₂Ti₂O₇, Dy₂V₂O₇, Er₂Mn₂O₇, Er₂Ru₂O₇, Er₂Sn₂O₇, Er₂Tc₂O₇, Er₂Ti₂O₇, Er₂V₂O₇, Eu₂Hf₂O₇, Eu₂Ir₂O₇, Eu₂Mo₂O₇, Eu₂Pb₂O₇, Eu₂Pt₂O₇, Eu₂Ru₂O₇, Eu₂ScNbO₇, Eu₂Sn₂O₇, Eu₂Ti₂O₇, Eu₂Zr₂O₇, Gd₂Ge₂O₇, Gd₂Hf₂O₇, Gd₂InSbO₇, Gd₂MnSbO₇, Gd₂Mo₂O₇, Gd₂Pb₂O₇, Gd₂Pt₂O₇, Gd₂

Note: E8₁, Pyrochlore Iridate.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A2B2C7_cF88_227_c_d_af-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.