未极化Bi_4Ti_3O_(12)-Bi_2Al_4O_9-Bi_2O_3复合陶瓷的压电各向异性  

Piezoelectric Anisotropy in a Non-poled Bi_4Ti_3O_(12)-Bi_2Al_4O_9-Bi_2O_3 Composite Ceramic

作　　者：王力海[1] 赵明磊[1] 王春雷[1] 张家良[1] 盖志刚[1] 王春明[1] 李吉超[1] 

机构地区：[1]山东大学物理学院晶体材料国家重点实验室,山东济南250100

出　　处：《压电与声光》2010年第5期841-844,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(50702030;50902087);山东省中青年科学家奖励基金资助项目(BS2009CL034);山东大学自主创新基金资助项目(2009TS103)

摘　　要：利用普通陶瓷烧结工艺制备出含Bi4Ti3O12、Bi2Al4O9和Bi2O3的复合陶瓷。该复合陶瓷中的Bi4Ti3O12晶粒具有较大的取向度因子,约为0.48。在未施加电场极化的情况下,该复合陶瓷显示出反常的压电效应。根据压电振动模式分析,该复合陶瓷的宏观对称性属于三斜晶系。我们认为,这一特殊的压电效应与该复合陶瓷中的空间电荷分布不均匀有关。Composite ceramic contained Bi4Ti3O12、Bi2Al4O9 and Bi2O3 phases was fabricated by the ordinary sintering technique.The Bi4Ti3O12 grains were found to have an orientation factor of f=0.48 in this ceramic.Before poling,this composite ceramic showed an anomalous piezoelectric effect which proved that the macroscopic symmetry of this composite ceramic belongs to the triclinic system.This anomalous piezoelectric effect maybe originates from inhomogeneous distribution of space charge in this composite ceramic and the probable causes of the inhomogeneity are discussed.

关 键 词：复合陶瓷 压电效应 晶粒取向 

分 类 号：TM22[一般工业技术—材料科学与工程]