Sm and Mn co-doped PMN-PT piezoelectric ceramics:Defect engineering strategy to achieve large d_(33)and high Q_(m)  

作　　者：Yixiao Yang Enwei Sun Zhimin Xu Huashan Zheng Bin Yang Rui Zhang Wenwu Cao 

机构地区：[1]Condensed Matter Science and Technology Institute,School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin 150080,China [2]Department of Mathematics and Materials Research Institute,The Pennsylvania State University,University Park,PA 16802,USA

出　　处：《Journal of Materials Science & Technology》2023年第6期143-151,共9页材料科学技术（英文版）

基　　金：This work was financially supported by the Natural Science Foundation of Heilongjiang Province(No.LH2021A012).

摘　　要：PbTiO_(3)-based piezoelectric ceramics are key materials for developing various electromechanical transduc-ers.For high-power ultrasonic transducers,piezoelectric ceramics are required to possess large piezo-electric coefficient(d_(33))and high mechanical quality factor(Q_(m)).Although acceptor dopants can im-prove Q_(m),they also deteriorate d_(33).If suitable piezoelectricity-beneficial donor dopants can be intro-duced into acceptor-doped ceramics,it is very possible to obtain large d_(33)and high Q_(m)simultaneously in donor and acceptor co-doped ceramics.In this work,a series of x mol%Sm and y mol%Mn co-doped Pb(Mg_(1/3)Nb_(2/3))O_(3)-30PbTiO_(3)(PMN-30PT:x Sm,y Mn)ceramics were prepared by the solid-phase sintered method.The crystal structure,local domain structure and electromechanical properties were sys-tematically analyzed.Optimal performances were obtained in PMN-30PT:2.5Sm,1-2Mn ceramics with d_(33)=860-543 pC/N,Q_(m)=495-754,and dielectric loss tanδ=0.0055-0.0086.This high performance origi-nates from the combined effects of(Mn″Ti−V_(o)^(••))^(×)defect dipoles and the local structural heterogeneity.

关 键 词：PMN-PT ceramics Sm and Mn co-doped Electromechanical properties Defect dipoles Local structural heterogeneity 

分 类 号：TM282[一般工业技术—材料科学与工程]