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“114”型氧化物SrAZn2GaAlO7(A = Ba2+,Sr2+)的晶体结构研究

发表时间:2021-12-31  浏览量:161  下载量:27
全部作者: 陈宇航,杨韬
作者单位: 重庆大学化学化工学院
摘 要: “114”型氧化物由于其独特的晶体结构与有趣的物理性质而受到了人们的广泛关注。为研究“114”化合物中A位离子的大小对结构对称性及原子占位的影响,设计合成了两个A位离子大小不同的“114”型新化合物SrAZn2GaAlO7(A = Ba2+,Sr2+). 粉末X射线衍射(powder X-ray diffraction,PXRD)分析结果表明,随着A位离子半径的减小,SrAZn2GaAlO7的结构对称性由P31c(A = Ba2+)降低到Pna21(A = Sr2+). 基于PXRD数据的Rietveld精修结果表明,SrAZn2GaAlO7中离子半径较小的Al3+倾向于占据三角层中的四面体间隙,而较大的Zn2+/Ga3+则倾向于占据Kagomé层中的四面体间隙。
关 键 词: 无机化学;“114”型氧化物;结构对称性;Rietveld精修;结构演变
Title: Crystal structures of “114”-type oxides SrAZn2GaAlO7 (A = Ba2+, Sr2+)
Author: CHEN Yuhang, YANG Tao
Organization: School of Chemistry and Chemical Engineering, Chongqing University
Abstract: The “114”-type oxides have gained extensive attention due to their unique crystal structures and intriguing physical properties. In this paper, two new “114”-type oxides, SrAZn2GaAlO7 (A = Ba2+, Sr2+), were designed and synthesized to investigate the influence of A-site cationic size on structural symmetry and atomic occupations. Powder X-ray diffraction (PXRD) results indicated that the structural symmetry of SrAZn2GaAlO7 (A = Ba2+, Sr2+) descended from P31c (A = Ba2+) to Pna21 upon decreasing the ionic radius of the A-site cations. Rietveld refinements of PXRD data revealed that Al3+ ions with a smaller ionic radius prefered to occupy the tetrahedral cavities within the triangular layer while the larger Zn2+/Ga3+ ions in favour of the tetrahedral cavities within the Kagomé layer.
Key words: inorganic chemistry; “114”-type oxides; structural symmetry; Rietveld refinement; structure evolution
发表期数: 2021年12月第4期
引用格式: 陈宇航,杨韬. “114”型氧化物SrAZn2GaAlO7(A = Ba2+,Sr2+)的晶体结构研究[J]. 中国科技论文在线精品论文,2021,14(4):504-510.
 
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