Iso-structural phase transition in tetramethylammonium nickel(Ⅱ)nitrite[(CH_3)_4N][Ni(NO_2)_3]  

作　　者：Li-Hui Kong Da-Wei Fu Qiong Ye Heng-Yun Ye Yi Zhang Ren-Gen Xiong 

机构地区：[1]Ordered Matter Science Research Center,Southeast University

出　　处：《Chinese Chemical Letters》2014年第6期844-848,共5页中国化学快报（英文版）

基　　金：supported by the Project 973(No. 2014CB848800);National Natural Science Foundation of China (Nos.91022003 and 21301029);Jiangsu Province NSF(No. BK20130600);Program for NCET and Ph.D.Programs Foundation of Ministry of Education of China(No.20130092120013)

摘　　要：The title compound, tetramethylammonium nickel nitrite [（CH3）4N][Ni（NO2）3], has a hexagonal perovskite-type structure with formula ABX3. It undergoes two reversible phase transitions occurring at about 409.1 and 428.4 K, associated with dielectric transitions. DSC measurement and dielectric measurement confirm the transition. The variable-temperature X-ray structural determinations and the powder X-ray diffraction （PXRD） experiments reveal that this compound has the same space group P3ml （No. 164） at 293 K, 413 K and 438 K. The phase transitions are caused by the rotation of the [（CH3）4N]＋ cation.The title compound, tetramethylammonium nickel nitrite [（CH3）4N][Ni（NO2）3], has a hexagonal perovskite-type structure with formula ABX3. It undergoes two reversible phase transitions occurring at about 409.1 and 428.4 K, associated with dielectric transitions. DSC measurement and dielectric measurement confirm the transition. The variable-temperature X-ray structural determinations and the powder X-ray diffraction （PXRD） experiments reveal that this compound has the same space group P3ml （No. 164） at 293 K, 413 K and 438 K. The phase transitions are caused by the rotation of the [（CH3）4N]＋ cation.

关 键 词：Phase transition Dielectric DSC PXRD X-ray structural Perovskite-type structure 

分 类 号：O614.813[理学—无机化学]