(Ba_(1-x)Ca_x)(Ti_(0.82)Zr(0.18))O_3陶瓷结构与介电性能研究  

Study of Structure and Dielectric Properties of (Ba_(1-x)Ca_x)(Ti_(0.82)Zr_(0.18)O_3 Ceramics

作　　者：那文菊[1] 丁士华[1] 宋天秀[1] 王久石[1] 王岩[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》2011年第6期655-658,共4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);西华大学研究生创新基金(YCJJ200924);材料学重点学科(XZD0814-09-1)~~

摘　　要：采用固相反应法制备了(Ba1-xCax)(Ti0.82Zr0.18)O3(BCZT,0≤x≤0.26)陶瓷,研究了Ca2+掺杂对BCZT陶瓷微观结构和介电性能的影响.结果表明:当Ca2+掺杂量为0.16时,BCZT陶瓷出现第二相CaTiO3,其四方率c/a随Ca2+掺杂量的增加先减小再增大,当Ca2+掺杂量为0.06时达到最小值1.00276.通过容差因子和晶格参数的计算确认了Ca2+已进入到A位;随Ca2+掺杂量的增加,晶粒得到细化,居里温度向低温方向移动,介电峰被压低并展宽,且逐渐呈现铁电弥散性.（Ba1-xCax）（Ti0.82Zr0.18）O3（BCZT,0≤x≤0.26） ceramics was prepared by a solid phase reaction.The effect of Ca2＋ doping on the microstructure and dielectric properties of the ceramics was studied.Results showed that the solid solubility lay around x=0.16 for BCZT ceramics while the second phase was observed.The value of c/a changed as the U-type curve with the variation of the Ca2＋,and the minimum of the c/a was 1.00276 at x=0.06.It was found that Ca2＋ ion substitution can be almost incorporated into the A site by the calculation of the tolerance factor and lattice constant.With increasing Ca2＋ ion content,the grain size was decreased.The Curie temperature was shifted to low temperature,and the εr-T peak was decreased and broaden.The relaxor characteristics were obtained while Ca2＋ ion content was further increased.

关 键 词：BCZT陶瓷 固溶度 四方率c/a 介电性能 

分 类 号：TM22[一般工业技术—材料科学与工程]