复合掺杂BCZT陶瓷的介电弛豫行为研究  

Study of Dielectric Relaxation Behavior of Co-doped BCZT Ceramics

作　　者：徐琴[1] 丁士华[1] 宋天秀[1] 彭勇[1] 吴小亮[1] 

机构地区：[1]西华大学材料科学与工程学院,成都610039

出　　处：《无机材料学报》2013年第4期441-446,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(11074203);西华大学人才基金(R0620109);材料学重点学科(XZD0814-09-1);西华大学研究生创新基金(YCJJ201257)~~

摘　　要：采用固相法制备了Ba0.9175Ca0.08Nd0.0025(Zr0.18Ti0.8175-xYxMn0.0025)O3(BCZT-Y,x=0、0.5mol%、0.75mol%、1.0mol%、1.5mol%、2.0mol%)铁电陶瓷,研究了不同Y3+掺杂量对该铁电陶瓷结构与介电性能的影响。结果表明:随着Y3+掺杂量增加,Y3+进入晶格,BCZT-Y陶瓷的密度从4.029 g/cm3增加到6.058 g/cm3;同时介电峰压低并展宽,居里温度向低温方向移动,表现出明显的铁电体弛豫特征,采用Lorenz型公式对该实验结果进行拟合验证,发现随着Y3+掺杂量增加,电滞回线变窄变斜、回线面积大幅减小,剩余极化强度和矫顽电场降低。Ba0.9175Ca0.08Nd0.0025（Zr0.18Ti0.8175-xYxMn0.0025）O3（BCZT-Y,x=0,0.5mol%,0.75mol%,1.0mol%,1.5mol%,2.0mol%） ferroelectric ceramics was prepared by a solid phase reaction.The influence of Y3＋ doping on the structure and dielectric properties of BCZT-Y ceramics was investigated.Results showed that with the Y3＋ contents increasing,Y3＋ ion substitution can be almost incorporated into the Ti4＋ site,and the density of BCZT-Y ceramics increased from 4.029 g/cm3 to 6.058 g/cm3.The Curie temperature was shifted to lower temperature,and the εr-T peak was decreased and broaden.The ferroelectric relaxor characteristics were obtained while Y3＋ ion content was further increased,which were consistent with the Lorenz-type formula fitting.It was found that the area of ferroelectric hysteresis loop became narrow and slant,the remnant polarization（Pr） and coercive field（Ec） reduced with the increase of Y3＋ content.

关 键 词：复合掺杂 介电性能 弛豫铁电体 电滞回线 

分 类 号：TM22[一般工业技术—材料科学与工程]