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Crystal structure of the Fe-member of usovite

机译:金刚玉Fe成员的晶体结构

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Crystals of the title compound, with the idealized composition Ba2CaFeAl2F14, dibarium calcium iron(II) dialuminium tetra­deca­fluoride, were obtained serendipitously by reacting a mixture of the binary fluorides BaF2, CaF2 and AlF3 in a leaky steel reactor. The compound crystallizes in the usovite structure type (Ba2CaMgAl2F14), with Fe2+ cations replacing the Mg2+ cations. The principal building units are distorted [CaF8] square-anti­prisms (point group symmetry 2), [FeF6] octa­hedra (point group symmetry -1) and [AlF6] octa­hedra that are condensed into undulating 2∞[CaFeAl2F14]4− layers parallel (100). The Ba2+ cations separate the layers and exhibit a coordination number of 12. Two crystal structure models with a different treatment of the disordered Fe site [mixed Fe/Ca occupation, model (I), versus underoccupation of Fe, model (II)], are discussed, leading to different refined formulae Ba2Ca1.310 (15)Fe0.690 (15)Al2F14 [model (I)] and Ba2CaFe0.90 (1)Al2F14 [model (II)].
机译:通过使二元氟化物BaF2,CaF2和AlF3的混合物在泄漏的钢反应器中反应,意外地获得了标题化合物的晶体,该化合物具有理想的组成Ba2CaFeAl2F14,二钡钙铁(II)十四氟化铝。该化合物以USovite结构类型(Ba2CaMgAl2F14)结晶,其中Fe2 +阳离子取代了Mg2 +阳离子。主要建筑单元变形为[CaF8]方形反棱镜(点群对称性2),[FeF6]八面体(点群对称性-1)和[AlF6]八面体,它们浓缩成平行的起伏2∞[CaFeAl2F14] 4−层( 100)。 Ba2 +阳离子将各层分开,并显示12的配位数。两种晶体结构模型,对无序的Fe位点进行了不同的处理[Fe / Ca混合占据,模型(I),与Fe的不足占据,模型(II)],讨论,得到不同的精炼公式Ba2Ca1.310(15)Fe0.690(15)Al2F14 [模型(I)]和Ba2CaFe0.90(1)Al2F14 [模型(II)]。

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