Enhanced electric-field induced strain in Eu^(3+) doped 0.67BiFeO_(3)-0.33BaTiO_(3) lead-free piezoelectric ceramics  

作　　者：Wei Li Tongxiang Liang Xiang He Vyunov Oleg Dongfang Pang Shan Wu 

机构地区：[1]College of Rare Earths,Jiangxi University of Science and Technology,Ganzhou,341000,China [2]Key Laboratory of High Performance Ceramics and Ultrastructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,201800,China

出　　处：《Journal of Rare Earths》2024年第9期1747-1754,I0004,共9页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China Youth Project (51702317);the Youth Project of the Natural Science Foundation of Jiangxi Provincial Science and Technology (20212BAB214019);the Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology (JXUSTQJYX2020004)。

摘　　要：Lead-free ferroelectric ceramics,0.67Bi_(1-x)Eu_(x)FeO_(3)-0.33BaTiO_(3)(BF-BT-xEu,x=0-0.02),were prepared via a solid-state reaction,The effect of Eu^(3+) doping on the microstructure,dielectric properties,ferroelectric properties,and electric-field-induced strain was investigated.The X-ray diffraction(XRD) results indicate the presence of a mixed phase of tetragonal and rhombohedral at the morphotropic phase boundary(MPB).Doping with an appropriate amount of Eu^(3+) reduces the Fe^(3+) content and decreases the leakage current in the binary system.A converse piezoelectric coefficient(d_(33)*) of 392 pm/V is obtained at BF-BT-0.003Eu under an electric field of 60 kV/cm at room temperature,which has a Curie temperature(T_(C)) of 414℃,The unipolar strain and d_(33)* of BF-BT-0.003Eu ceramics increase to 0.438%and 730 pm/V at 125℃ The field-induced strain response of the BF-BT-0.003Eu ceramics is greater than that of 0.67BF-0.33BT,mainly due to its optimal grain size,reduction of leakage current,and coexistence of ferroelectric-relaxation phases,BF-BT-0.003Eu ceramic is a lead-free candidate for high-temperature actuator applications.

关 键 词：FERROELECTRIC Field-induced strain CERAMICS LEAD-FREE Rare earths 

分 类 号：TQ174.1[化学工程—陶瓷工业]