铁电性
反铁电性
四方晶系
材料科学
偶极子
电场
咪唑
极化(电化学)
化学物理
分子
极化密度
结晶学
晶体结构
凝聚态物理
光电子学
化学
电介质
立体化学
磁化
物理
有机化学
物理化学
磁场
量子力学
作者
Sachio Horiuchi,Fumitaka Kagawa,Kensuke Hatahara,Kensuke Kobayashi,Reiji Kumai,Youichi Murakami,Y. Tokura
摘要
The imidazole unit is chemically stable and ubiquitous in biological systems; its proton donor and acceptor moieties easily bind molecules into a dipolar chain. Here we demonstrate that chains of these amphoteric molecules can often be bistable in electric polarity and electrically switchable, even in the crystalline state, through proton tautomerization. Polarization-electric field (P-E) hysteresis experiments reveal a high electric polarization ranging from 5 to 10 μC cm(-2) at room temperature. Of these molecules, 2-methylbenzimidazole allows ferroelectric switching in two dimensions due to its pseudo-tetragonal crystal symmetry. The ferroelectricity is also thermally robust up to 400 K, as is that of 5,6-dichloro-2-methylbenzimidazole (up to ~373 K). In contrast, three other benzimidazoles exhibit double P-E hysteresis curves characteristic of antiferroelectricity. The diversity of imidazole substituents is likely to stimulate a systematic exploration of various structure-property relationships and domain engineering in the quest for lead- and rare-metal-free ferroelectric devices.
科研通智能强力驱动
Strongly Powered by AbleSci AI