Ba3Mg4Au4 – a ternary auride composed of BaAu2- and BaMg2Au-related slabs

Zeitschrift für Naturforschung B Pub Date : 2024-04-05 DOI:10.1515/znb-2023-0033

Maximilian Kai Reimann, Jutta Kösters, Rainer Pöttgen

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Abstract

The ternary auride Ba3Mg4Au4 was synthesized from the elements in a sealed tantalum ampoule. The Ba3Mg4Au4 structure was refined from single-crystal X-ray diffractometer data: Gd3Cu4Ge4 type, space group Immm, a = 447.95(10), b = 843.07(18), c = 1564.2(5) pm, wR2 = 0.0935, 680 F 2 values, 23 variables. Ba3Mg4Au4 is a 1:2 intergrowth structure of BaAu2-(AlB2 type) and BaMg2Au-(MgCuAl2 type) related slabs. The two crystallographically independent gold atoms both have tricapped trigonal prismatic coordination, i.e. Au1@Mg6Ba3 and Au2@Mg2Ba6Au. The Au–Mg (284–303 pm) and Ba–Au (331–349 pm) distances cover small ranges that are close to the sums of the covalent radii. The magnesium atoms in the MgCuAl2-related slab show Mg–Mg distances of 320–332 pm. The different coloring variants of the Gd3Cu4Ge4 type are briefly discussed.

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Ba3Mg4Au4 - 由 BaAu2-和 BaMg2Au 相关板块组成的三元榴辉体

三元极光 Ba3Mg4Au4 是在一个密封的钽安瓿瓶中用这些元素合成的。Ba3Mg4Au4 的结构是根据单晶 X 射线衍射仪数据提炼出来的：Gd3Cu4Ge4 类型，空间群 Immm，a = 447.95(10)，b = 843.07(18)，c = 1564.2(5) pm，wR2 = 0.0935，680 F 2 值，23 个变量。Ba3Mg4Au4 是 BaAu2-（AlB2 型）和 BaMg2Au-（MgCuAl2 型）相关板坯的 1:2 互生结构。两个晶体学上独立的金原子都具有三顶三棱配位，即 Au1@Mg6Ba3 和 Au2@Mg2Ba6Au。Au-Mg（284-303 pm）和 Ba-Au（331-349 pm）的距离范围很小，接近共价半径之和。MgCuAl2 相关板块中的镁原子显示出 320-332 pm 的镁-镁距离。本文简要讨论了 Gd3Cu4Ge4 类型的不同着色变体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Zeitschrift für Naturforschung B

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