Crystal Lab › Prototype structures › Orthorhombic
α-IrV
Orthorhombic · space group Cmmm (No. 65) · Pearson oC8
Symmetry elements and Wyckoff positions (interactive)
α-IrV in Cmmm
SettingUnit cell
- Lattice constants
- a = 6.756 Å, b = 5.971 Å, c = 2.796 Å; α = 90.00°, β = 90.00°, γ = 90.00°
- Cell volume
- 112.8 ų
- Atoms in the conventional cell
- 8 (Ir 4, V 4)
- Formula units Z
- 4
- Pearson symbol
- oC8 — orthorhombic, base-centred lattice, 8 atoms per conventional cell
- Symmetry operations
- 16 per cell
Crystallographic sites
| Site | Element | Wyckoff | Multiplicity | x | y | z |
|---|---|---|---|---|---|---|
| Ir1 | Ir | 4g | 4 | 0.2200 | 0.0000 | 0.0000 |
| V2 | V | 4j | 4 | 0.0000 | 0.7200 | 0.5000 |
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 8 atoms drawn above are these sites multiplied by all 16 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
AB_oC8_65_g_j-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oC8, then the space-group number 65, then the Wyckoff letters occupied by each element in turn (Ir: 4g; V: 4j). Two structures with the same label are the same arrangement with different cell parameters or coordinates.
Other compounds with this structure
AuNa, CdTe, RhV <!--beginning with an
Note: α-IrV.
Source
Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry AB_oC8_65_g_j-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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