具有铁电性和铁弹性并存的轴性-性BINOL多铁晶体
Yu-Ling Zeng1, Yong Ai1, Shu-Yu Tang1
1Ordered Matter Science Research Center, Nanchang University, Nanchang330031, People's Republic of China.
Journal of the American Chemical Society
|October 12, 2022
概括
研究人员使用BINOL开发了新的轴性-性多铁晶体. 这些高温材料表现出铁电和铁弹性,为新的分子多铁设计铺平了道路.
科学领域:
- 材料科学
- 固态物理
- 晶体学
背景情况:
- 在材料科学中,性是自然和物理学的基本性质.
- 在设计分子铁电时建立了点性.
- 然而,对于铁电材料设计而言,轴向性仍未得到充分研究.
研究的目的:
- 设计和合成新的轴性-性多铁晶体.
- 研究这些新材料的铁电和铁弹性特性.
- 探索轴性性在高温多铁体中的作用.
主要方法:
- 基于BINOL的轴性-性有机化合物的合成 ((R) -BINOL-DIPASi和 (S) -BINOL-DIPASi).
- 使用压电力显微镜 (PFM) 进行铁电域观测.
- 极化电压 (P-V) 歇斯底里循环以确认铁电和域切换.
- 极化光显微镜 (PLM) 用于可视化铁弹性域的演变.
主要成果:
- 成功设计和合成 (R) -BINOL-DIPASi和 (S) -BINOL-DIPASi,这是第一个轴性-性高温多铁晶体.
- 在高温 (362 K和363 K) 上观察2F1型的完全铁电/铁弹性相变.
- 通过PFM和P-V循环演示铁电域切换,并使用PLM可视化条形铁弹性域.
结论:
- 以BINOL构成块为例的轴性性,有效地诱导分子材料中的极性结构和铁电性.
- 有机成分增强了旋转能量屏障,导致高相位过渡温度.
- 这项研究通过结合轴性性来设计分子多铁的有效策略,开辟了材料发现的新途径.
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