Crystal structure of the ternary silicide Gd2Re3Si5

A single crystal of the title compound, the ternary silicide digadolinium trirhenium pentasilicide, Gd 2 Re 3 Si 5 , was isolated from an alloy of nominal composition Gd 20 Re 30 Si 50 synthesized by arc melting and investigated by X-ray single-crystal diffraction. Its crystal structure belongs to the U 2 Mn 3 Si 5 structure type. All atoms in the asymmetric lie on special positions. The Gd site has site symmetry m ..; the two Mn atoms have site symmetries m .. and 2.22; the three Si atoms have site symmetries m .., ..2 and 4.. . The coordination polyhedra of the Gd atoms have 21 vertices, while those of the Re atoms are cubooctahedra and 13-vertex polyhedra. The Si atoms are arranged as tricapped trigonal prisms, bicapped square antiprisms, or 11-vertex polyhedra. The crystal structure of the title compound is also related to the structure types CaBe 2 Ge 2 and W 5 Si 3 . It can be represented as a stacking of Gd-centred polyhedra of composition [GdSi 9 ]. The Re atoms form infinite chains with an Re—Re distance of 2.78163 (5) Å and isolated squares with an Re—Re distance of 2.9683 (6) Å.

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