Abnormal phase transition and polarization mismatch phenomena in BaTiO_(3)-based relaxor ferroelectrics  

作　　者：Qingyuan Hu Xiaoyong Wei 

机构地区：[1]Electronic Materials Research Laboratory,Key Laboratory of the Ministry of Education Xi’an Jiaotong University,Xi’an,Shaanxi 710049,P.R.China [2]International Center for Dielectric Research,School of Electronic Science and Engineering Xi’an Jiaotong University Xi’an,Shaanxi 710049,P.R.China

出　　处：《Journal of Advanced Dielectrics》2019年第5期1-27,共27页先进电介质学报（英文）

基　　金：supported by the National Nature Science Foundation of China(Grant Nos.51772239,51761145024);the National Basic Research Program of China(973 Program)under the Grant No.2015CB654602;the International Science&Technology Cooperation Program of China(Grant 2015DFA51100);“111”Project(No.B14040),and Shaanxi Province Project(2017ktpt-21,2018TD-024)。

摘　　要：Relaxor ferroelectrics have been extensively studied due to their outstanding dielectric,piezoelectric,energy storage,and electro-optical properties.Although various theories were proposed to elaborate on the relaxation phenomena,polar nanoregions formed by disruption of the long-range-order structures are considered to play a key role in relaxor ferroelectrics.Generally,relaxor ferro-electrics are formed by aliovalent substitution or isovalent substitution in normal ferroelectrics,or further combinations of solid solutions.Herein,one category of BaTiO_(3)-based relaxor ferroelectrics with abnormal phase transition and polarization mismatch phenomena is focused.Characteristic parameters of such BaTiO_(3)-based relaxor ferroelectrics,including the Curie temperature,polarization,and lattice parameter,show a typical“U”-shaped variation with compositions.The studied BaTiO_(3)-based relaxor ferroelectrics are mostly solid solutions of A-site coupling and B-site coupling ferroelectrics,exhibiting polarization mismatch in certain compositions[e.g.,0.9BaTiO_(3)-0.1BiScO_(3),0.8BaTiO_(3)-0.2Bi(Mg_(1/2)Ti_(1/2)O_(3),0.8BaTiO_(3)-0.2Bi(Mg_(2/3)Nb_(1/3)O_(3),0.5BaTiO_(3)-0.5Pb(Mg_(1/3)Nb_(2/3)O_(3),0.4BaTiO_(3)-0.6Pb(Zn_(1/3)Nb_(2/3)O_(30,etc.].Of particular interest is that excellent electrical properties can be achieved in the studied relaxor ferroelectrics.Therefore,polarization mismatch theory can also provide guidance for the design of new high-performance lead-free relaxor ferroelectrics.

关 键 词：Relaxor ferroelectrics phase transition polarization mismatch energy storage 

分 类 号：TN9[电子电信—信息与通信工程]