Ba_(1-x)Bi_x(Ti_(0.9)Zr_(0.1))O_3陶瓷的介电弛豫特征  

Dielectric Relaxation Properties of Ba_(1-x)Bi_x(Ti_(0.9)Zr_(0.1))O_3 Ceramics

作　　者：丁士华[1] 王久石[1] 宋天秀[1] 那文菊[1] 王岩[1] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039

出　　处：《西华大学学报（自然科学版）》2011年第3期38-42,共5页Journal of Xihua University:Natural Science Edition

基　　金：国家自然科学基金(11074203);西华大学材料学重点学科基金(XZD0814-09-1);校人才基金(R0620109);西华大学研究生创新基金(YCJJ200924)

摘　　要：采用固相反应法制备了Ba1-xBix(Ti0.9Zr0.1)O3(x=0.01,0.02,0.03,0.04)陶瓷,X射线衍射分析表明所有样品均是四方晶体结构,3%mol的Bi3+能够完全溶入钙钛矿晶格中。不同频率下Ba1-xBix(Ti0.9Zr0.1)O3陶瓷的介电温谱显示所有样品均表现出弥散相变的特征,在x≥0.02的三组样品又表现出弛豫铁电体的特征。通过纳米极性微区和畴壁探讨了弛豫现象产生的机理。Ba1-xBix（Ti0.9Zr0.1）O3（x=0.01,0.02,0.03,0.04） ceramics is prepared by a conventional ceramics preparation technique.X-ray diffraction analysis indicates that all of the ceramics samples are tetragonal crystal structure,and 3% mol of Bi3＋ doping can be fully incorporated into the perovskite lattice.The dielectric constants as a function of temperature at different frequencies show that all of the ceramics have characteristics of ferroelectrics with diffused phase transition,and the ceramics sample of x≥0.02 exhibits typical relaxor ferroelectric characteristic.The relaxor characteristics are discussed according to polar nano-microregion and domain wall.

关 键 词：Ba1-xBix(Ti0.9Zr0.1)O3陶瓷 弥散相变 介电弛豫 纳米极性微区 畴壁 

分 类 号：TM22[一般工业技术—材料科学与工程]