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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Chains of condensed RuSm6/2 octahedra in Sm_3RuMg 7 - A ternary ordered version of the Ti_6Sn_5 type
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Chains of condensed RuSm6/2 octahedra in Sm_3RuMg 7 - A ternary ordered version of the Ti_6Sn_5 type

机译：Sm_3RuMg 7中的稠密RuSm6 / 2八面体链-Ti_6Sn_5类型的三元有序版本

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摘要

The magnesium-rich intermetallic compound Sm_3RuMg7 was synthesized by induction melting of the elements. Single crystals were grown by slow cooling of the polycrystalline sample. The structure was characterized by powder and single-crystal X-ray diffraction: ordered Ti6Sn 5 type, P63/mmc, Z = 2, a = 1034.1(2), c = 611.3(1) pm, wR2 = 0.0216, 399 F2 values and 19 parameters. The ruthenium atoms have slightly distorted octahedral samarium coordination. These RuSm 6/2 octahedra (Ru-Sm 279 pm) are condensed via common faces leading to chains in the c direction which are arranged in the form of a hexagonal rod packing. Between these rods the Mg2 atoms build chains of face-sharing trigonal prisms. Alternately these prisms are centered by Mg3 or capped by Mg1 atoms on the rectangular faces. Within the magnesium substructure the Mg-Mg distances range from 303 to 335 pm. The Mg3 site shows slight mixing with samarium, leading to the composition Sm3.16RuMg6.84 for the investigated crystal. The compounds RE3RuMg7 (RE = Gd, Tb) are isotypic.
机译：通过元素的感应熔化合成了富镁金属间化合物Sm_3RuMg7。通过缓慢冷却多晶样品来生长单晶。结构通过粉末和单晶X射线衍射表征：有序Ti6Sn 5型，P63 / mmc，Z = 2，a = 1034.1（2），c = 611.3（1）pm，wR2 = 0.0216，399 F2值和19个参数。钌原子的八面体sa配位略微失真。这些RuSm 6/2八面体（Ru-Sm 279 pm）通过通向c方向的链的公共面冷凝，这些链以六边形的杆状填料的形式排列。在这些棒之间，Mg2原子构成面共享三角棱镜的链。或者，这些棱镜在矩形面上以Mg3居中或被Mg1原子覆盖。在镁亚结构内，Mg-Mg距离范围为303至335 pm。 Mg3位点显示出与slight的轻微混合，导致所研究晶体的成分为Sm3.16RuMg6.84。化合物RE3RuMg7（RE = Gd，Tb）是同型的。

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