准同型相界(MPB)附近BS-PT高温压电陶瓷研究  

High Temperature Piezoelectric Ceramics (1-x)BiScO_(3-x)PbTiO_3 Near the Morphotropic Phase Boundary (MPB)

作　　者：冯亚军[1] 徐卓[1] 李振荣[1] 张麟[1] 姚熹[1] 

机构地区：[1]西安交通大学电子陶瓷与器件教育部重点实验室,西安710049

出　　处：《无机材料学报》2006年第5期1127-1133,共7页Journal of Inorganic Materials

基　　金：国家"973"计划(2002CB613307);国家自然科学基金(50472052);教育部重点科研项目(03155)

摘　　要：(1-x)BiScO3-xPbTiO3陶瓷(简记BS-PT)在x=64．0％附近存在一个从菱方晶系过渡到四方晶系的准同型相界,在此相界附近材料能获得优良的介电和压电性能．本文选取PbTiO3含量在64．0％-65．5％的准同型相界附近的材料组分,利用传统的固相烧结反应法合成了纯钙钛矿相结构的BS-PT陶瓷,通过对材料的相结构形成过程和内部形貌分析以及对介电、压电性能的研究,发现在x=64．5％的组分条件下,BS-PT陶瓷材料获得了准同型相界范围内的最优的压电性能,其室温压电常数d33可达500pC／N,且居里温度(Tc)达到了438℃,剩余极化强度和电致应变分别为44μC／cm2和3．5‰．研究表明,准同型相界附近的BS-PT陶瓷是一种优良的压电换能器和传感器材料．Abstract： （1-x）BiScO3-xPbTiO3 （BS-PT） ceramics exhibits excellent dielectric and piezoelectric properties in the vicinity of the morphotropic phase boundary （x=64.0% mol fraction PbTiO3）, which separates the rhombohedral phase from tetragonal phase. In our study, the pure perovskite BS-PT ceramics was obtained with compositions near the MPB for x varying from 64.0% to 65.5% using traditional solid state reaction. The perovskite phase formation process and microstructure were investigated and also the dielectric and piezoelectric properties were studied. The results show that BS-PT ceramics with x=64.5% has an optimized piezoelectric characterization, its piezoelectric coefficient d33 can reach to as high as 500 pC/N at room temperature, the Curie temperature （Tc） can reach to 438℃, with the remnant polarization Pr=44μC/cm^2, electrical field reduced strain 3.5 %0. Our research results show that the BS-PT ceramics with the compositions near the morphotropic phase boundary is a good candidate material for the piezoelectric actuator and transducers.

关 键 词：BS-PT 准同型相界 高居里温度 压电陶瓷 

分 类 号：TM282[一般工业技术—材料科学与工程]