Ca_xSr_(1-x)Bi_2Nb_2O_9无铅压电陶瓷制备及其高温稳定性研究  

Preparation and High Temperature Stability of Ca_xSr_(1-x)Bi_2Nb_2O_9 Lead-free Piezoelectric Ceramics

作　　者：姚忠冉 初瑞清[1] 徐志军[1] 郝继功[1] 李国荣[2] 

机构地区：[1]聊城大学材料科学与工程学院,聊城252059 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2015年第9期989-994,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(51372110;51402144;51302124);国家高技术研究发展计划(863计划;2013AA030801);山东省自然科学基金(ZR2012EMM004;ZR2012AL06);广东省科技计划(2013B091000001);山东省自主创新及成果转化专项(2014CGZH0904);山东省高等学校科技计划项目(J14LA10;J14LA11);聊城大学研究基金(318011301;318011306)~~

摘　　要：采用传统固相法制备了CaxSr1-xBi2Nb2O9(x=0、0.10、0.25、0.40)无铅压电陶瓷,研究了Ca2+掺杂量对其微观结构、电学性能及其高温稳定性的影响。掺入Ca2+并未改变Sr Bi2Nb2O9陶瓷的晶体结构;随着Ca2+掺杂量的增加,陶瓷晶粒由片状向长条状转变;陶瓷的矫顽场(Ec)下降,剩余极化强度(Pr)先增大后减小;陶瓷的居里温度由450℃升高到672℃。当x=0.10时,陶瓷具有较好的综合性能:2Pr=14.8μC/cm2,d33=22 p C/N,Tc=488℃;当退火温度达到400℃时,压电常数d33仍达到20 p C/N,说明该材料具有较好的温度稳定性,可以在400℃的高温环境中应用。CaxSr1-xBi2Nb2O9（x=0, 0.10, 0.25, 0.40） ceramics were prepared by solid-state reaction method, and their microstructure, electrical and temperature stability properties were systematically investigated. It is found that Ca-doping does not change the phase structure of Sr Bi2Nb2O9. With increasing Ca2＋ contents, microstructure of the CaxSr1-xBi2Nb2O9 ceramics changes from sheet to long strips. The remnant polarization（Pr） increases firstly and then decreases, reaching the maximum value at x=0.01, while the coercive field（Ec） decreases gradually. Furthermore, Ca-doping can also improve the Curie temperature, which increases from 450 to 67℃ 2℃ with increase of Ca2＋ contents. The optimum electrical properties can be obtained at x=0.10 as 2Pr=14.8 μC/cm2, d33=22 p C/N and Tc=488℃. In addition, after annealing at 400℃, the piezoelectric constant（d33） of the ceramics remains 20 p C/N, showing good temperature stability for high temperature applications.

关 键 词：陶瓷 Ca2+掺杂 CaxSr1-xBi2Nb2O9 电学性能 

分 类 号：TM282[一般工业技术—材料科学与工程]