(1-x)BNKT_2-xBCT无铅压电陶瓷介电铁电及电致应变性能研究  

Dielectric ferroelectric properties and electric field-induced strain in (1-x)BNKT_2-xBCT lead-free piezoelectric ceramics

作　　者：宋武辉[1] 杨敬娜[1] 刘倩[1] 赵小刚[1] 程琳[1] 梁海荣[1] 闫妍[1] 刘鹏[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710062

出　　处：《陕西师范大学学报（自然科学版）》2012年第2期29-34,共6页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(10074043)

摘　　要：采用固相反应法,制备了(1-x)BNKT2-xBCT无铅压电陶瓷.研究了BCT加入对其相结构、介电、铁电、电致应变性能的影响.实验结果表明:在设定条件下,所有样品都形成了纯的钙钛矿结构,且在x=0.04～0.08之间处于四方相和伪立方相的过渡区域.材料去极化温度趋向于室温附近.弛豫性增强(γ=1.94),强烈削弱了材料的铁电性,使得剩余极化强度和压电系数减小很多.在x=0.04组分附近应变量达到最大值(0.122%),d33*达到230pm/V.The（1-x）BNKT2-xBCT lead free ceramics are prepared by the conventional solid-state sintering process.The phase components,dielectric,ferroelectric properties and electric field-induced strain with BCT are investigated.It is indicated that under the demanded condition all samples are pure perovskite structure,tetragonal and pseudo-cubic phase transition region exists in the range of x=0.04 to 0.08.The depolarization temperature of the material tend to room temperature and relaxation enhancements to γ=1.94.The ferroelectric of the material is weakened strongly,making the remanent polarization and piezoelectric coefficient appears significant reduction.Near the x=0.04 strain reached maximun 0.122%,d33＊ reached 230 pm/V.

关 键 词：弛豫性 铁电性能 电致应变 

分 类 号：TN911.72[电子电信—通信与信息系统] R318[电子电信—信息与通信工程]