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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >The solid solution MgxIn3-xIr - Formation of the FeGa3 type up to x=0.73 and the cementite structure with x=0.92
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The solid solution MgxIn3-xIr - Formation of the FeGa3 type up to x=0.73 and the cementite structure with x=0.92

机译:固溶体MgxIn3-xIr-形成x = 0.73的FeGa3型和x = 0.92的渗碳体结构

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摘要

Various compounds within the solid solution MgxIn3-xIr (x = 0-0.92) have been prepared from the elements by melting in glassy carbon crucibles in a water-cooled sample chamber in a high-frequency furnace. The structures of six single crystals with x = 0.25, 0.58, 0.62, 0.64, 0.71, and 0.73 have been refined from X-ray diffractometer data. These intermetallics crystallize with the tetragonal FeGa3 structure, space group P4(2)/mnm: a = 700.6(l), c = 709.1 (1) pm, wR2 = 0.0397, 296 F-2 values, 18 parameters for Mg0.73In2.27Ir. This structure is an intergrowth of AlB2 and W related slabs. The 4c and 8j indium sites show mixed occupancy with magnesium. For all crystals the 4c site within the cubes has a higher magnesium population. With increasing magnesium content, a switch in the structure type is observed. Mg0.92In2.08Ir adopts the Fe3C structure, space group Pnma: a = 745.5(3), b = 837.7(3), e = 514.2(2) pm, wR2 = 0.0724, 738 F-2 values, 25 parameters. The iridium atoms are coordinated by eight (FeGa3 type) and nine (Fe3C type) indium/magnesium atoms in both structure types. The FeGa3 and the Fe3C type both derive from the aristotype U3Si2 as presented by a group-subgroup scheme.
机译:固溶体MgxIn3-xIr(x = 0-0.92)中的各种化合物是通过在高频炉中水冷样品室中的玻璃状碳坩埚中熔融而由元素制备的。从X射线衍射仪数据中提炼出六个x = 0.25、0.58、0.62、0.64、0.71和0.73的单晶的结构。这些金属间化合物以四方FeGa3结构,空间群P4(2)/ mnm结晶:a = 700.6(l),c = 709.1(1)pm,wR2 = 0.0397,296 F-2值,Mg0.73In2的18个参数。 27Ir。这种结构是AlB2和W相关平板的共生体。 4c和8j铟位点与镁混合占据。对于所有晶体,立方体内的4c位具有较高的镁原子数。随着镁含量的增加,观察到结构类型的转换。 Mg0.92In2.08Ir采用Fe3C结构,空间群Pnma:a = 745.5(3),b = 837.7(3),e = 514.2(2)pm,wR2 = 0.0724,738 F-2值,25个参数。两种结构类型中的铱原子均由八个(FeGa3型)和九个(Fe3C型)铟/镁原子配位。 FeGa3和Fe3C类型都衍生自亚基型U3Si2(由组-子组方案表示)。

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