Structural phase transition and dielectric switching in an organic-inorganic hybrid rare-earth double perovskite-type compound:(DMP)_(2)LaRb(NO_(3))_(6)(DMP=N,N-dimethylpyrrolidinium cation)

作     者：Jiajun Ma Qi Xu Le Ye Qinwen Wang Zhixin Gong Chao Shi Hengyun Ye Yi Zhang Jiajun Ma;Qi Xu;Le Ye;Qinwen Wang;Zhixin Gong;Chao Shi;Hengyun Ye;Yi Zhang

作者机构：Chaotic Matter Science Research CenterJiangxi University of Science and TechnologyGanzhou 341000China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2022年第40卷第6期

页      面：937-941,I0004页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(21805119,21875093) Youth Science Foundation of Jiangxi Provincial Office of Science and Technology(20192ACBL21010) Natural Science Foundation of Jiangxi Province(20204BCJ22015,20202ACBL203001) 

主　　题：Switchable dielectric constant Phase transition Rare earths Double perovskite 

摘      要：In recent years,it has been found that the flexibility of structure and diversity of the components endow quite an amount of the organic-inorganic hybrid perovskites with novel properties,i.e.,structural phase *** the natural advantage of the perovskite-type structure in generation of stimuliresponsive or smart materials,we synthesized an organic-inorganic hybrid rare-earth double perovskitetype compound,(DMP)_(2) LaRb(NO_(3))_(6)(DMP=N,N-dimethylpyrrolidinium cation,1).It shows reversible phase transition at 219/209 K(heating/cooling).Variable-temperature single-crystal structure analysis and dielectric constant measurements reveal that the thermal vibrations of the polar cation guests and the distortion of the anionic cage-like framework are the origin of the phase ***,the movement of polar cation in crystal lattices arouses dielectric transition between the low-and highdielectric states,resulting in a switchable property of dielectric *** results reveal that the rare-earth double perovskite provides a promising platform for achieving switchable physical/chemical properties.