Crystal engineering regulation achieving inverse temperature symmetry breaking ferroelasticity in a cationic displacement type hybrid perovskite system

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外文摘要：Ferroelastic hybrid perovskite materials have been revealed the significance in the applications of switches,sensors,actuators,etc.However,it remains a challenge to design high-temperature ferroelastic to meet the requirements for the practical applications.Herein,we reported an one-dimensional organic-inorganic hybrid perovskites(OIHP)(3-methylpyrazolium)CdCl3(3-MBCC),which possesses a mmmF2/m ferroelastic phase transition at 263 K.Moreover,utilizing crystal engineering,we replace-CH3 with-NH2 and-H,which increases the intermolecular force between organic cations and inorganic frameworks.The phase transition temperature of(3-aminopyrazolium)CdCl3(3-ABCC),and(pyrazolium)CdCl3(BCC)in-creased by 73 K and 10 K,respectively.Particularly,BCC undergoes an unconventional inverse temperature symmetry breaking(ISTB)ferroelastic phase transition around 273 K.Differently,it transforms from a high symmetry low-temperature paraelastic phase(point group 2/m)to a low symmetry high-temperature fer-roelastic phase(point group(1))originating from the rare mechanism of displacement of organic cations phase transition.It means that crystal BCC retains in ferroelastic phase above 273 K until melting point(446 K).Furthermore,characteristic ferroelastic domain patterns on crystal BCC are confirmed with po-larized optical microscopy.Our study enriches the molecular mechanism of ferroelastics in the family of organic-inorganic hybrids and opens up a new avenue for exploring high-temperature ferroic materials.

外文关键词：

Organic-inorganic hybrid perovskiteCrystal engineeringInverse temperature symmetry breakingDisplacement type phase transitionFerroelasticity

作者：

Na Wang、Wang Luo、Huaiyi Shen、Huakai Li、Zejiang Xu、Zhiyuan Yue、Chao Shi、Hengyun Ye、Leping Miao

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作者单位：

Chaotic Matter Science Research Center,Department of Materials,Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China

基金：

国家自然科学基金国家自然科学基金Open Project Program of Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry,Jiangxi University of 国家自然科学基金江西省自然科学基金江西省自然科学基金

项目编号：

221750792220508720212BCD420182227507520204BCJ2201520202ACBL203001

出版年：

2024

DOI：

10.1016/j.cclet.2023.108696

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

年,卷(期)：2024.35(5)

参考文献量53