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Synthesis and Crystal Structure of a 6H Hexagonal Fluoro-Perovskite: RbMgF3

机译:6H六边形氟 - 钙钛矿的合成和晶体结构:RBMGF3

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RbMgF3, a perovskite halide, serendipitously crystallized from a reaction between MgCl2 and TiO2 in molten RbCl/RbF eutectic flux (melting point = 546 degrees C) and was characterized by single crystal X-ray diffraction. RbMgF3 crystals can also be grown directly in higher yield using a molten RbCl-RbF flux layered over MgCl2 or MgF2 contained in a silver tube at 575 degrees C. RbMgF3 crystallizes in the hexagonal space group P6(3)/mmc in the 6H hexagonal perovskite structure type with lattice parameters a = 5.8368(2) angstrom and c = 14.2087(5) angstrom. The crystal structure exhibits face-sharing Mg2F9 octahedra connected via corner-sharing MgF6 octahedra. Elemental composition for RbMgF3 was semi-quantitatively confirmed by energy dispersive spectroscopy (EDS). Graphic X-ray diffraction quality single crystals of RbMgF3 were grown from a molten RbCl/RbF eutectic flux at 850 degrees C and used for structure determination using single crystal X-ray diffraction. The compound crystallizes in the hexagonal space group P63/mmc in the 6H hexagonal structure type.
机译:RbMgF3是一种钙钛矿卤化物,由MgCl2和TiO2在熔融RbCl/RbF共晶熔剂(熔点=546℃)中的反应意外结晶,并通过单晶X射线衍射进行了表征。RbMgF3晶体也可以使用熔融的RbCl RbF助焊剂以更高的产率直接生长,该助焊剂在575℃下层叠在银管中的MgCl2或MgF2上。RbMgF3以6H六方钙钛矿结构类型在六方空间群P6(3)/mmc中结晶,晶格参数a=5.8368(2)埃,C=14.2087(5)埃。该晶体结构显示出通过共角MgF6八面体连接的共面Mg2F9八面体。能量色散光谱(EDS)半定量地证实了RbMgF3的元素组成。用熔融的RbCl/RbF共晶熔剂在850℃下生长出具有X射线衍射质量的RbMgF3单晶,并用单晶X射线衍射测定其结构。该化合物在六方空间群P63/mmc中以6H六方结构类型结晶。

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