高居里温度铋层状结构钛钽酸铋（Bi3TiTaO9）的压电、介电和铁电特性  

Piezoelectric, dielectric, and ferroelectric properties of high Curie temperature bismuth layer-structured bismuth titanate-tantalate（Bi3TiTaO9）

作　　者：郑隆立 齐世超 王春明[2,3] 石磊 Zheng Long-Li;Qi Shi-Chao;Wang Chun-Ming;Shi Lei(Shandong Experimental High School,Jinan 250001,China;School of Physics,State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China;Taishan College,Shandong University,Jinan 250100,China)

机构地区：[1]山东省实验中学,济南250001 [2]山东大学物理学院,晶体材料国家重点实验室,济南250100 [3]山东大学泰山学堂,济南250100

出　　处：《物理学报》2019年第14期342-349,共8页Acta Physica Sinica

基　　金：山东省重点研发计划(批准号:2019GGX102064);国家自然科学基金(批准号:51872166);山东大学基本科研业务费(批准号:2017JC032)资助的课题~~

摘　　要：随着现代信息技术的飞速发展,压电材料的应用范围进一步拓展,使用的温度环境越来越严苛,在一些极端环境下对压电材料的服役性能提出了新的挑战.因此研究具有高居里温度同时具有较强压电性能的压电材料,是迫切需要解决的问题.本文利用普通陶瓷工艺制备了高居里温度铋层状结构钛钽酸铋Bi3TiTaO9+x wt.%CeO2(x=0—0.8,简写为BTT-10xCe)压电陶瓷,研究了钛钽酸铋陶瓷的压电、介电和铁电特性.压电特性研究表明,稀土Ce离子的引入可以提高BTT陶瓷的压电性能,BTT-6Ce(x=0.6)陶瓷具有最大的压电系数d33~16.2 pC/N,约为纯的BTT陶瓷压电系数(d33~4.2 pC/N)的4倍.介电特性研究显示,BTT和BTT-6Ce(x=0.6)陶瓷均具有高的居里温度,Tσ分别为890℃和879℃,同时稀土Ce离子的引入降低了BTT陶瓷的高温介电损耗tanδ.铁电特性研究表明,稀土Ce离子的引入提高了BTT陶瓷的极化强度.在180℃温度下和110 kV/cm的电场驱动下,BTT和BTT-6Ce(x=0.6)陶瓷的矫顽场Ec分别为53.8 kV/cm和57.5 kV/cm,剩余极化强度Pr分别为3.4μC/cm^2和5.4μC/cm^2.退火实验显示:稀土Ce离子组分优化的BTT压电陶瓷经800℃的高温退火后,仍具有优异的压电性能温度稳定性.研究结果表明,BTT-6Ce(x=0.6)陶瓷兼具高的居里温度Tc约为879℃和强的压电性能d33约为16.2 pC/N、较好的压电性能温度稳定性,是一类压电性能优异的高温压电陶瓷.Piezoelectric materials have been extensively employed in numerous devices.With the rapid development of modern information technology,the high temperature piezoelectric materials that can work in extreme environments are in great demand.Therefore,it is urgent to investigate piezoelectric materials with high Curie temperature and strong piezoelectric performance.This paper reports the significantly improved piezoelectric properties of high temperature bismuth titanate-tantalate(Bi3TiTaO9,BTT)polycrystalline ceramics.In this work,the rare-earth cerium ions modified Bi3TiTaO9 piezoelectric ceramics are prepared by the conventional ceramic technique.The introduction of Ce ions significantly enhances the piezoelectric performance of BTT ceramics.The BTT-6Ce(BTT+0.6 wt.%CeO2)exhibits optimized piezoelectric properties with a piezoelectric coefficient d33 of 16.2 pC/N,which is four times the value of unmodified BTT(d33~4.2 pC/N).The dielectric and ferroelectric measurements indicate that Ce ions remarkably reduce the dielectric loss tand and increase polarizations,which are beneficial to the piezoelectric properties.The BTT and BTT-6Ce(x=0.6)ceramics each have a high Curie temperature TC:~890℃and 879℃,respectively.The coercive field Ec of BTT and BTT-6Ce ceramics are 53.8 kV/cm and 57.5 kV/cm,respectively,while the remnant polarizations Pr of BTT and BTT-6Ce ceramics are 3.4μC/cm^2 and 5.4μC/cm^2,respectively,at a frequency of 1 Hz,temperature of 180℃,and drive field of 110 kV/cm.The thermal annealing measurements indicate that the BTT ceramics still possess stable piezoelectric properties after being annealed at 800℃.The results exhibit that the cerium-modified BTT ceramics are good materials for high temperature applications.

关 键 词：铋层状结构铁电体 Bi3TiTaO9 压电陶瓷 高居里温度 

分 类 号：TQ174.1[化学工程—陶瓷工业]