Organic ferroelastic enantiomers with high Tc and large dielectric switching ratio triggered by order-disorder and displacive phase transition  

作　　者：Zhaohong Chen Mengzhen Li Jinfei Lan Shengqian Hu Xiaogang Chen 

机构地区：[1]Ordered Matter Science Research Center,Nanchang University,Nanchang 330031,China

出　　处：《Chinese Chemical Letters》2024年第10期228-232,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.22201120)。

摘　　要：Molecular-based ferroelastics with dielectric switching properties are highly desirable for their applications on microelectronic dielectric switches,sensors,data storage,and so on.However,the current reports mostly focus on organic-inorganic hybrids containing toxic heavy metal atoms,and the relatively low phase transition temperature limits their application.In this paper,low-toxic organic salt ferroelastic enantiomers(R/S)-4-fluoro-1-azabicyclo[3.2.1]octonium chloride[(R/S)-F-321]were designed and synthesized under the introducing chirality strategy.They undergo a 432F422-type ferroelastic phase transition with a high Curie temperature(Tc)of 470 K,simultaneously exhibiting excellent dielectric switching characteristics.In addition to the ordered-disordered movement of cations,the significant displacement of anions is also responsible for such high Tc and large dielectric switching ratios,which is very rare in molecular-based switching materials.This work enriches the development of molecular ferroelastic switching materials and gives inspiration for the exploration of environmentally friendly high Tc organic salt ferroelastics with prominent switching performances.

关 键 词：Organic salt ENANTIOMERS FERROELASTIC Dielectric switching PHASETRANSITION 

分 类 号：TB322[一般工业技术—材料科学与工程]