Influence of Bi nonstoichiometry on the energy storage properties of 0.93KNN–0.07BixMN relaxor ferroelectrics  

作　　者：Xiaoshuang Qiao Xiaoshuai Zhang Di Wu Xiaolian Chao Zupei Yang 

机构地区：[1]Key Laboratory for Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy Devices School of Materials Science and Engineering Shaanxi Normal University,Xi’an 710062,Shaanxi,P.R.China

出　　处：《Journal of Advanced Dielectrics》2018年第6期61-69,共9页先进电介质学报（英文）

基　　金：supported by National Science Foundation of China(Grant Nos.51572163,51577111 and 51607108);the Fundamental Research Funds for the Central Universities(Program Nos.GK201601003,GK201703016,GK201802007,201701011 and 2018CBLZ007).

摘　　要：Ceramic-based dielectric capacitors are becoming more and more important in electronic devices.The ceramics of 0.93K_(0.5)Na_(0.5)NbO_(3)–0.07Bix(Mg_(1/3)Nb_(2/3))O_(3)(0.93KNN–0.07BixMN)(x?0:60,2/3,0.75 and 0.95)were successfully fabricated by virtue of the solid reaction process in this work.The results showed that the amount of Bi content has a significant impact on the ceramics of 0.93KNN–0.07BixMN.XRD indicates that all specimens exhibit a pure perovskite structure and existing oxygen vacancy in the specimens.The mean grain size for all specimens belong to submicron scale,and the sample of x=0.95 owns the smallest grain size is 0.11
m.The maximum dielectric constant increases but the phase transition temperature Tm exhibits a contrary tendency at 1MHz with increasing Bi concentration.Besides,all ceramics are relaxor ferroelectric.The impedance analysis further revealed that the activation energy of the ceramics increases with Bi content.Eventually,the highestηof 58.8%and Wrec of 1.30 J/cm^(3) are simultaneously achieved in the sample with x=0.60.Overall,we demonstrate in this work that stoichiometry control of Bi in 0.93KNN–0.07BixMN ceramics is a practical method to obtain the desired structural,dielectric and energy storage properties.

关 键 词：Oxygen vacancy NONSTOICHIOMETRY energy storage 

分 类 号：TQ1[化学工程]