Cai Zhuoer, Zhang Yinan, He Xiaofan, Chen Jian, Hua Xiu-Ni, Shi Ping-Ping, Sun Baiwang
School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China.
School of Environmental Science, Nanjing Xiaozhuang University, Nanjing, 211171, P. R. China.
Small. 2024 Nov;20(46):e2403390. doi: 10.1002/smll.202403390. Epub 2024 Aug 6.
Antiferroelectric (AFE) materials, characterized by double electric hysteresis loops, can be transformed to the ferroelectric (FE) phase under an external electric field, making them promising candidates for electronic energy storage and solid-state refrigeration. Additionally, the field-induced strain in AFE materials is contingent upon the direction of the electric field, rendering it with a switching characteristic. Although AFE materials have made progress in the field of energy storage and negative electrocaloric effect, the coexistence of AFE and ferroelasticity is still rarely reported. Here, two isomorphic organic-inorganic hybrid perovskites, HDAEPbCl and HDAEPbBr (HDAE is [2-(hydroxydimethylammonio)ethan-1-aminium]), exhibiting FE-AFE-PE (PE is paraelectric) phase transitions, are presented. Remarkably, the temperature range where AFE and ferroelasticity coexist is significantly broadened from 59.9 K to 115.1 K by strengthening short-range forces via halogen substitution. This discovery extends the family of FE, AFE, and ferroelastic materials, contributing to the development of multifunctional materials and advancing multifunctional material development.
反铁电（AFE）材料具有双电滞回线的特征，在外部电场作用下可转变为铁电（FE）相，这使其成为电子能量存储和固态制冷领域有潜力的候选材料。此外，AFE材料中的场致应变取决于电场方向，使其具有开关特性。尽管AFE材料在能量存储和负电热效应领域取得了进展，但AFE与铁弹性共存的情况仍鲜有报道。在此，展示了两种同构的有机-无机杂化钙钛矿，HDAEPbCl和HDAEPbBr（HDAE为[2-(羟基二甲基铵基)乙烷-1-铵基]），它们呈现出FE-AFE-顺电（PE）相变。值得注意的是，通过卤素取代增强短程力，AFE与铁弹性共存的温度范围从59.9 K显著拓宽至115.1 K。这一发现扩展了铁电、反铁电和铁弹性材料家族，有助于多功能材料的发展并推动多功能材料的研发。
