Effects of rare-earth dopants on phase structure and electrical properties of lead-free bismuth sodium titanate-based ceramics

作     者：Anping Deng Jiagang Wu 

作者机构：Department of Materials ScienceSichuan UniversityChengdu610064China 

出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)

年 卷 期：2020年第6卷第2期

页      面：286-292页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：the support of the National Natural Science Foundation of China(51972215) 

主　　题：BNT-Based ceramics Rare earth doping Phase structure Electrical properties 

摘      要：In this work,the effects of rare earth(RE)dopants on the phase structure,microstructure,and electrical properties of lead-free bismuth sodium titanate(BNT)-based ceramics were *** earth elements(i.e.,Sm,Gd,Ho,Pr,Y,and Yb)were selected as the dopants to replace the Bi site of Bi_(0.5)(Na_(0.8)K_(0.2))0.5TiO_(3) *** was found that the addition of moderate RE ions reduced the temperature of ferroelectricrelaxor transition(T_(f-r))and the dielectric maximum at lower temperature,while the slight influence on the dielectric maximum at higher temperature and microstructure were ***,the threestage evolution of phase structure after introducing RE ions was confirmed.A high piezoelectric coefficient d_(33) of ~190 pC/N was achieved due to the improved dielectric constant in the state with stable electric field-induced ferroelectric *** high strain property and converse piezoelectric coefficient d_(33)* of ~340 pm/V were obtained in the state with the coexistence of nonergodic and ergodic relaxor phases when T_(f-r) approached room *** degenerated overall electromechanical properties exhibited in the state with complete ergodic relaxor *** study affords a significant guidance for optimizing the piezoelectricity of BNT-based ceramics utilizing rare earth dopants.