KNN-LTN基无铅压电织构陶瓷的相结构与性能  

Phase Structure and Properties of Textured KNN-LTN Lead-free Piezoelectric Ceramics

作　　者：高峰[1] 刘亮亮[1] 邓贞奇[1] 李博[1] 许贝[1] 田长生[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《压电与声光》2013年第5期711-715,共5页Piezoelectrics & Acoustooptics

基　　金：航空科学基金资助项目(2009ZF53061);西北工业大学基础研究基金资助项目(GY04XD901)

摘　　要：以片状NaNbO3为籽晶模板,采用反应模板晶粒生长法制备了K0.48Na0.52NbO3-LiTa0.5Nb0.5O3(KNN-LTN)基无铅压电织构陶瓷,研究了保温时间对陶瓷显微组织结构、织构度和电性能的影响规律,结果表明,织构陶瓷由钙钛矿相和钨青铜结构的K3Li2Nb5O15相组成,随着保温时间的增加,陶瓷的织构度逐渐增大,保温10h时织构度最大(0.725);织构陶瓷的介电常数随着保温时间的增加而增大,介电损耗则随之增加而减小。与传统的自由取向的KNN-LTN基陶瓷相比,织构陶瓷的压电常数d33提高,并随着保温时间的增加而增大。The textured K0.48Na0.52NbO3-LiTa0.5Nb0.5O3（KNN-LTN） lead-free ceramics were fabricated by the reactive templated grain growth（RTGG） technique with the plate-like NaNbO3 particles as template. The effects of soaking time on the phase structure, the texture fraction and the electrical properties were investigated. The results show that the textured ceramics contain perovskite KNN-LTN and tungsten-bronze-type K3 Li2 Nb5 O15 phases. The texture fraction increased with the increasing soaking time and it reached the maximum value of 0. 725 at soaking time of 10 h. The dielectric constant increased and the dielectric loss decreased with the increasing soaking time. Compared with the conventional ceramics,the piezoelectric constant d33 of textured ceramics enhanced and increased with the increasing soaking time.

关 键 词：无铅压电陶瓷 铌酸钾钠 织构 保温时间 

分 类 号：TN304[电子电信—物理电子学]