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

被引：6
|
作者：
Usman, Mohammad [1 ]
Ayer, Gyanendra B. [1 ]
Smith, Mark D. [1 ]
Zur Loye, Hans-Conrad [1 ]
机构：
[1] Univ South Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA
来源：
JOURNAL OF CHEMICAL CRYSTALLOGRAPHY | 2021年 / 51卷 / 01期
基金：
美国国家科学基金会;
关键词：
RbMgF3; Crystal growth; Perovskite halide materials; PHYSICAL-PROPERTIES; GROWTH; FAMILY; MG; CO; LN;
D O I：
10.1007/s10870-020-00834-5
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
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. [GRAPHICS] .
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页码：9 / 13
页数：5
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