"114"型氧化物 SrAZn2GaAlO7(A = Ba2+, Sr2+)的晶体结构研究
Investigation of the crystal structure of the 114-type oxides SrAZn2GaAlO7(A = Ba2+, Sr2+)
"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。本文设计合成了两个"114"型新氧化物 SrAZn2GaAlO7 (A = Sr2+，Ba2+)，并通过 Rietveld 精修确定了它们的晶体结构。SrBaZn2GaAlO7 的结构对称性为P31c，而 A 位离子较小的 Sr2Zn2GaAlO7 的结构对称性为 Pna21。结构精修结果表明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位置，而较大的 Zn2+/Ga3+ 则倾向于占据 Kagomé 层中的四面体间隙。结构精修得到的SrAZn2GaAlO7 中T-O平均键长的变化规律也与 Al3+，Zn2+/Ga3+的分布规律相匹配。
he "114" type oxides have gained extensive attention due to their unique crystal structure and interesting physical properties. In this work, two new "114"-type oxides, SrAZn2GaAlO7 (A = Sr2+, Ba2+), were rational designed and synthesized, and their crystal structures were determined by Rietveld refinements. The structure symmetry of SrBaZn2GaAlO7 was determined to be P31c, while Sr2Zn2GaAlO7 exhibits a lower structure symmetry of Pna21. Rietveld refinement results revealed that Al3+ prefer to occupy the tetrahedral cavity that within the triangular layer, whereasthe larger Zn2+/Ga3+ cations mainly locate at the Kagomé layer.The average bond length of T-O in SrAZn2GaAlO7 obtained by Rietveld refinementalso matches the distribution of Al3+ and Zn2+/Ga3+.
杨韬、陈宇航
晶体学化学物理学
无机化学高温固相法氧化物结构演变对称性
Inorganic chemistryhigh temperature solid methodoxidestructure evolutionsymmetry
杨韬,陈宇航."114"型氧化物 SrAZn2GaAlO7(A = Ba2+, Sr2+)的晶体结构研究[EB/OL].(2021-05-11)[2025-08-10].http://www.paper.edu.cn/releasepaper/content/202105-40.点此复制
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