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.
Highlights
A single crystal of the title compound, the ternary silicide digadolinium trirhenium pentasilicide, 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
The Si atoms are arranged as tricapped trigonal prisms, bicapped square antiprisms, or 11-vertex polyhedra
Summary
Four structure types of composition R2T3Si5 are known for the systems R–T–Si (R = rare-earth element, T = d-block element): U2Mn3Si5 (Yarmolyuk et al, 1977) (Pearson symbol tP40, space group P4/mnc), U2Co3Si5 (Akselrud et al, 1977) (oI40, Ibam), Nd2Os3Si5 (Rizzoli et al, 2004) (tP48, P4/mnc) and Lu2Co3Si5 (Chabot & Parthe, 1985) (mS40, C2/c). The structure type U2Mn3Si5 has representatives in the systems R–Mn–Si (R = Y, Gd–Lu), R–Re–Si (R = Y, La–Nd, Sm, Gd– Tm), R–Fe–Si (R = Sc, Y, Sm, Gd–Lu), R–Ru–Si (R = Sm, Er, Lu), whereas the structure type U2Co3Si5 has been found in the systems R–Ru–Si (R = Tb, Er), R–Co–Si (R = Sc, Y, Ce, Gd–Er), R–Rh–Si (R = Y, La, Ce, Nd, Sm, Gd–Er), R–Ir–Si (R = Y, Ce, Tb, Lu), R–Ni–Si (R = Y, Ce, Nd, Sm, Gd–Tm), R–Pt–Si (R = Ce, Sm), and R–Pd–Si (R = Ce, Sm), the structure type Nd2Os3Si5 in the systems R–Os–Si (R = Nd, Eu), and the structure type Lu2Co3Si5 in the systems R–Co–Si (R = Y, Tb, Dy, Lu), R–Rh–Si (R = Y, Tb, Dy) and R–Ni–Si (R = Lu) (Villars & Cenzual, 2013).
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