(Bi_(0.5)Na_(0.5))TiO_3系无铅压电陶瓷特性与原子组成的关系  

The Relations between the Piezoelectric Properties and the Atomic Behavior of (Bi_(0.5)Na_(0.5))TiO_3 Based Lead-free Ceramics

作　　者：鄢洪建[1] 肖定全[1] 朱建国[1] 余萍[1] 赁敦敏[1] 李桂英[1] 

机构地区：[1]四川大学材料科学系

出　　处：《压电与声光》2005年第3期240-242,共3页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金委员会资助项目(59972020);国家"八六三"计划资助项目(2001-AA325060)

摘　　要：整体考虑ABO3型钙钛矿结构压电陶瓷中的A位和B位离子的离子半径、原子量和电负性对压电陶瓷特性的影响,定义了一个包含有A-位和B-位离子的质量差M、离子半径差R及电负性差X有关的综合因子F(w),该因子与自发极化密切相关。研究了(Bi0.5Na0.5)TiO3基压电陶瓷的压电性能与F(w)的关系发现,机电耦合系数k33、kp随着F(w)的增加而相应增大,当F(w)为160～165时,kp增加迅速,其后增加缓慢;F(w)与k33则近似直线关系。A comprehensive weight factor F(w) was defined from the point of view that the differences of the ionic size R,atomic weight M, and electric negative X of the A-site and B-site ions of the ABO_3 perovskite ceramics are correlated to the spontaneous polarization (P_s) of the materials. It was found that F(w) has good correspondence with the piezoelectric coupling factors k_(33) and k_p reported up to now of (Bi_(0.5)Na_(0.5))TiO_3 based lead-free piezoelectric ceramic. With increasing of the value of F(w), the k_(33) and k_p increase consequently. By using the comprehensive weight factor F(w), a new (Bi_(0.5)Na_(0.5))TiO_3 based lead-free piezoelectric ceramics were invented and patented.

关 键 词：(BI0.5NA0.5)TIO3 无铅压电陶瓷 材料设计 

分 类 号：TM221[一般工业技术—材料科学与工程]