Crystal structure of the ternary silicide Gd2Re3Si5.

IF 0.9
Vitaliia Fedyna, Roksolana Kozak, Roman Gladyshevskii
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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.

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三元硅化物Gd2Re3Si5的晶体结构。
从名义成分为Gd20Re30Si50的合金中分离出了标题化合物二adadolinium trihenium五硅化物Gd2Re3Si5的单晶,并用x射线单晶衍射对其进行了研究。其晶体结构属于U2Mn3Si5结构型。不对称结构中的所有原子都位于特殊位置。Gd位点具有位点对称m..;两个Mn原子具有位置对称性m。和2.22;三个Si原子具有位对称性m。, . .2和4…Gd原子的配位多面体有21个顶点,而Re原子的配位多面体为立方八面体和13顶点多面体。硅原子排列成三棱柱、二棱柱方形反棱柱或11顶点多面体。标题化合物的晶体结构也与结构类型CaBe2Ge2和W5Si3有关。它可以表示为以gd为中心的组成多面体的堆叠[GdSi9]。Re原子形成无限链,Re-Re距离为2.78163 (5)Å, Re-Re距离为2.9683 (6)Å。
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来源期刊
自引率
33.30%
发文量
0
审稿时长
1.3 months
期刊介绍: Acta Crystallographica Section E: Structure Reports Online is the IUCr highly popular open-access structural journal. It provides a simple and easily accessible publication mechanism for the growing number of inorganic, metal-organic and organic crystal structure determinations. The electronic submission, validation, refereeing and publication facilities of the journal ensure very rapid and high-quality publication, whilst key indicators and validation reports provide measures of structural reliability. In 2009, the journal published over 4000 structures. The average publication time is less than one month.
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