通过空位和阴离子工程在A位缺少的矿中进行可切换的极化
Suguru Yoshida1, Olivier Hernandez2, Jinsuke Miyake3
1Department of Energy and Hydrocarbon Chemistry, Kyoto University, Kyoto 615-8510, Japan.
Journal of the American Chemical Society
|January 24, 2026
概括
缺陷排序的矿,如Y1/3TaO3,可以通过控制结构不稳定性来实现室温铁电. 这种缺陷工程策略增强了两极分化,并为新型功能材料提供了途径.
科学领域:
- 材料科学
- 固态物理
- 晶体学
背景情况:
- 晶体缺陷通常是有害的, 但可以为功能设计.
- 有序空缺的矿可能表现出复杂的结构不稳定性.
研究的目的:
- 在缺乏A位点的矿Y1/3TaO3中证明室温铁电性.
- 研究有序空位和八面体旋转在诱导铁电极化的作用.
- 探索在缺陷排序材料中增强两极分化的策略.
主要方法:
- 构成选择有利于特定的结构不稳定性.
- 模块化晶体结构的超空间分析.
- 预测材料属性的格子动力学计算.
主要成果:
- 在室温下,Y1/3TaO3在P b 2 1 m阶段表现出类似切换的极化.
- 有序的空位和TaO6八面体旋转使铁电反应成为可能.
- 在~750K时会发生相向非相称相的过渡.
- 预计上轴应变会进一步增强室温偏振.
结论:
- 矿的缺陷排序可以绕过中心对称状态并诱导铁电.
- Y1/3TaO3系统证明了实现增强两极化的可行策略.
- 这种缺陷工程方法可用于其他不合适的铁电和多铁电.
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