在非火电旋转金属有机框架中的压电过渡
Shunsuke Kitou1, Hajime Ishikawa2, Yusuke Tokunaga1
1Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan.
Journal of the American Chemical Society
|March 24, 2025
概括
一个新的旋转金属有机框架 (MOF) 从非压电转变为低于120K的压电状态.这种由有序的硫酸四面体驱动的变化产生螺旋式电偶极,并证明了压力依赖的压电.
科学领域:
- 材料科学
- 晶体学
- 固态物理
背景情况:
- 432晶体点组缺乏反向对称性,但通常是非压电的.
- 属于432点组的状结构具有独特的同位素网络特性.
- 金属有机框架 (MOF) 为高级应用提供可调节的结构和特性.
研究的目的:
- 调查状腺酸MOF的结构和物理特性.
- 探索这种材料中的相位过渡和电.
- 了解硫酸四面体在诱导电偶极时刻中的作用.
主要方法:
- 在单晶上进行同步射线衍射,以识别结构相变.
- 在多晶样品上测量热电流以检测电极化.
- 分析晶体点组变化和分子排序.
主要成果:
- 在120K时观察到立方体到立方体的结构相变.
- 点组从非压电432变为压电23在120K以下.
- 扭曲的SO4四面体的排列导致电双极时刻的3D螺旋排列,诱导压力依赖的压电.
结论:
- 由于对称性破裂和螺旋双极排序,旋转性酸MOF表现出低于120K的压力依赖压电反应.
- 这种材料为研究由分子排序和结构灵活性产生的独特介电性质提供了一个平台.
- 这项研究强调了MOF在开发新型压电材料方面的潜力.
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