Synthesis and Crystal Structure of a 6H Hexagonal Fluoro-Perovskite: RbMgF3
Synthesis and Crystal Structure of a 6H Hexagonal Fluoro-Perovskite: RbMgF3
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DOI：
10.1007/s10870-020-00834-5
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发表时间：
2020-05
影响因子：
0.8
通讯作者：
M. Usman;Gyanendra B Ayer;Mark D. Smith;H. Loye
中科院分区：
文献类型：
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作者：
M. Usman;Gyanendra B Ayer;Mark D. Smith;H. Loye
trbmgf3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℃）中偶然结晶而成，并通过x射线单晶衍射进行了表征。rbmgf3晶体也可以在575°C的银管中使用熔融RbCl-RbF助熔剂分层在mgcl2或mgf2上，以更高的产量直接生长。rbmgf3在六角形空间群pp63 /mmc中结晶为6H六角形钙钛矿结构类型，晶格参数sa= 5.8368(2) Å， c= 14.2087(5) Å。晶体结构为面共享mg2f9八面体，通过角共享mgf6八面体连接。用能谱仪（EDS）半定量地确定了rbmgf3的元素组成。在850℃的熔融RbCl/RbF共晶熔剂中生长出具有x射线衍射质量的RbMgF3单晶，并用单晶x射线衍射法测定其结构。该化合物在六方空间群pp63 /mmc中结晶，为6H六方结构类型。
AbstractRbMgF3, a perovskite halide, serendipitously crystallized from a reaction between MgCl2and TiO2in molten RbCl/RbF eutectic flux (melting point = 546 °C) and was characterized by single crystal X-ray diffraction. RbMgF3crystals can also be grown directly in higher yield using a molten RbCl–RbF flux layered over MgCl2or MgF2contained in a silver tube at 575 °C. RbMgF3crystallizes in the hexagonal space groupP63/mmcin the 6H hexagonal perovskite structure type with lattice parametersa= 5.8368(2) Å andc= 14.2087(5) Å. The crystal structure exhibits face-sharing Mg2F9octahedra connected via corner-sharing MgF6octahedra. Elemental composition for RbMgF3was semi-quantitatively confirmed by energy dispersive spectroscopy (EDS).Graphic AbstractX-ray diffraction quality single crystals of RbMgF3 were grown from a molten RbCl/RbF eutectic flux at 850 °C and used for structure determination using single crystal X-ray diffraction. The compound crystallizes in the hexagonal space groupP63/mmcin the 6H hexagonal structure type.