Ferroelastic phase transitions in three new layered perovskites:(3-XC_(6)H_(5)CH_(2)CH_(2)NH_(3))_(2)[CdCl_(4)](X=F,Cl,and Br)  

作　　者：Yaping Gong Xiaoxian Chen Bingqing Zhao Jun Wang Weixiong Zhang Xiaomin Chen 

机构地区：[1]MOE Key Laboratory of Bioinorganic and Synthetic Chemistry,School of Chemistry,Sun Yat-Sen University,Guangzhou 510275,China

出　　处：《Chinese Chemical Letters》2023年第12期470-475,共6页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(NSFC,Nos.22071273 and 21821003);Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(No.2017BT01C161).

摘　　要：Two-dimensional organic-inorganic hybrid ferroelastics with high-temperature reversible phase transitions are very rare and have become one of the research hotspots in the field of ferroelastic materials.Herein,we report three new layered organic-inorganic hybrid perovskites based on halogen-substituted phenethylaminium,(3-XC_(6)H_(5)CH_(2)CH_(2)NH_(3))_(2)[CdCl_(4)](X=F(1),CI(2)and Br(3)).They undergo structural phase transitions at 376/371 K,436/430 K,and 421/411 K,respectively,between the isomorphic hightemperature phases(space group I4/mmm,Z=2)and different room-temperature phases with the reduced structural symmetries,i.e.,P21/a(Z=2)in 1,Pi(Z=4)in 2,and P21/a(Z=4)in 3,respectively.These ferroelastic transitions arise from the order-disorder transition of organic cations together with the synchronous displacement of inorganic layers,accompanying with feroelastic spontaneous strains of 0.16,0.13 and 0.12 for 1-3,respectively.By enriching layered perovskite ferroelastics based on halogensubstituted cations,this work provides important clues for exploring new ferroic materials based on hybrid crystals.

关 键 词：Layered perovskite Phase transition Halogen-substituted FERROELASTIC Spontaneous strain 

分 类 号：TB34[一般工业技术—材料科学与工程]