title: Crystal structure of the ternary silicide Gd2Re3Si5.
abstract: A single crystal of the title compound, the ternary silicide digadolinium trirhenium penta-silicide, Gd2Re3Si5, was isolated from an alloy of nominal composition Gd20Re30Si50 synthesized by arc melting and investigated by X-ray single-crystal diffraction. Its crystal structure belongs to the U2Mn3Si5 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 cubo-octa-hedra and 13-vertex polyhedra. The Si atoms are arranged as tricapped trigonal prisms, bicapped square anti-prisms, or 11-vertex polyhedra. The crystal structure of the title compound is also related to the structure types CaBe2Ge2 and W5Si3. It can be represented as a stacking of Gd-centred polyhedra of composition [GdSi9]. 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.
authors.affiliation: Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla i Mefodiya st. 6, UA-79005 Lviv, Ukraine.
authors.forename: Vitaliia
authors.initials: V
authors.lastname: Fedyna
authors.affiliation: Laboratory of Crystallography, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, CH-8093 Zurich, Switzerland.
authors.forename: Roksolana
authors.initials: R
authors.lastname: Kozak
authors.affiliation: Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla i Mefodiya st. 6, UA-79005 Lviv, Ukraine.
authors.forename: Roman
authors.initials: R
authors.lastname: Gladyshevskii
keywords: crystal structure; gadolinium; inter­metallic compound; rhenium; silicon; ternary silicide