Si₂U₃ (D5_{a})

Unit cell

Lattice constants

a = 7.336 Å, b = 7.336 Å, c = 3.890 Å; α = 90.00°, β = 90.00°, γ = 90.00°

Cell volume

209.4 ų

Atoms in the conventional cell

10 (U 6, Si 4)

Formula units Z

2

Pearson symbol

tP10 — tetragonal, primitive lattice, 10 atoms per conventional cell

Symmetry operations

16 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 10 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

A2B3_tP10_127_g_ah-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol tP10, then the space-group number 127, then the Wyckoff letters occupied by each element in turn (U: 2a; Si: 4g; U: 4h). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Other compounds with this structure

Ag₂Eu₃, Ag₂Yb₃, Al₂Th₃, Au₂La₃, Au₂Y₃, B₂Mo₃, B₂Nb₃, B₂Ta₃, B₂V₃, Be₂Nb₃, Be₂Ta₃, Ga₂Nb₃, Ga₂Ta₃, Ga₂Th₃, Ga₂Zr₃, Ge₂Hf₃, Ge₂Th₃, Hg₂Ca₃, Hg₂Sr₃, Pd₂Er₃, Pd₂Gd₃, Si₂Ce₃, Si₂Hf₃, Si₂La₃, Si₂Mo₃, Si₂Nb₃, Si₂Np₃, Si₂Pr₃, Si₂Pu₃, Si₂Th₃, Si₂U₃, Si₂W₃, Si₂Zr₃, Sr₂Pb₃, Al₂Th₃, B₂Mo₃, B₂Nb₃, B₂Ta₃, B₂V₃, Be₂Nb₃, Be₂Ta₃, Ga₂Nb₃, Ga₂Ta₃, Ga₂Zr₃, Ge₂Th₃, Pd₂Dy₃, Pd₂Ho₃, Si₂Hf₃, Si₂Th₃, Si₂Zr₃ <!--beginning with an

Note: D5_{a}.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A2B3_tP10_127_g_ah-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.