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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Two metal-rich phosphides - The crystal structures of Mg8Ir23P8 and Mg13Pt26P10
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Two metal-rich phosphides - The crystal structures of Mg8Ir23P8 and Mg13Pt26P10

机译：两种富含金属的磷化物-Mg8Ir23P8和Mg13Pt26P10的晶体结构

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摘要

Mg8Ir23P8 (a = 8.586(4), b = 16.998(7), c = 3.959(2) angstrom) and Mg13Pt26P10 (a = 8.834(2), b = 21.154(4), c = 4.074(l) angstrom) crystallize in new structure types (Pbam, Z = 1), which were determined by single crystal methods. In the Ir compound four of seven crystallographically different Ir atoms build up cuboctahedra centered by other Ir atoms. The cuboctahedra are connected with each other via common faces to strands along [001] and they are linked with Ir-5 square pyramids centered by P atoms to a three-dimensional network, in which some of the Ir atoms are part of both polyhedra. The Mg atoms are situated in the holes of the network coordinated by 14 nearest neighbours. The structure Of Mg13Pt26P10 is quite similar and contains cuboctahedra too, but they are formed by both kinds of metal atoms building two different polyhedra. The first type is centered by Pt atoms, whereas the centers of the other one are occupied by Mg atoms and P-2 dumb-bells with a statistical distribution. The cuboctabedra are linked with each other via common faces along [001] and edges along [100] and they are connected with Pt-5 square pyramids centered by P atoms in a similar fashion like in Mg8Ir23P8.
机译：Mg8Ir23P8（a = 8.586（4），b = 16.998（7），c = 3.959（2）埃）和Mg13Pt26P10（a = 8.834（2），b = 21.154（4），c = 4.074（l）埃）结晶通过单晶方法确定的新结构类型（Pbam，Z = 1）。在Ir化合物中，七个在晶体学上不同的Ir原子中的四个以其他Ir原子为中心形成立方八面体。立方八面体通过共同的面彼此沿着[001]相连，并与以P原子为中心的Ir-5方形金字塔相连，形成一个三维网络，其中一些Ir原子是两个多面体的一部分。 Mg原子位于网络的孔中，该孔由14个最近的邻居协调。 Mg13Pt26P10的结构非常相似，也包含立方八面体，但是它们是由两种金属原子构成的两个不同的多面体形成的。第一种以Pt原子为中心，而另一种类型的中心被Mg原子和具有统计分布的P-2哑铃占据。立方八面体通过沿[001]的公共面和沿[100]的边相互连接，并且它们以与Mg8Ir23P8类似的方式与以P原子为中心的Pt-5正方形金字塔相连。

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