Bi0.5Na0.5TiO3-BaTiO3系无铅陶瓷的压电、铁电及热释电性能  

Piezoelectric,Ferroelectric and Pyroelectric Properties of Lead-free Bi0.5Na0.5TiO3-BaTiO3 System Ceramics

作　　者：李慧[1] 张金平[1] 禹春来 郭同洲 李乐[1] 曲慧新 张洋洋[1,3] LI Hui;ZHANG Jinping;YU Chunlai;GUO Tongzhou;LI Le;QU Huixin;ZHANG Yangyang(Engineering Department,Huanghe Science and Technology College,Zhengzhou 450006,China;School of Physical Sciences,University of Science and Technology of China,Hefei 230000,China;Henan Key Laboratory of Nanocomposites and Applications,Huanghe Science and Technology College,Zhengzhou 450006,China)

机构地区：[1]黄河科技学院工学部,河南郑州450006 [2]中国科学技术大学物理学院,安徽合肥230000 [3]黄河科技学院河南省纳米复合材料与应用重点实验室,河南郑州450006

出　　处：《材料科学与工程学报》2020年第2期201-208,共8页Journal of Materials Science and Engineering

基　　金：郑州市科技局资助项目(20140755,20150345,121PYFZX178);河南省高等学校重点科研资助项目(19A510017,17A413008);河南省科技攻关资助项目(202102210021);河南省高等学校青年骨干教师资助项目(2017GGJS187);郑州市智能检测技术及应用重点实验室资助项目。

摘　　要：使用传统的固相烧结法制备了(1-x)Bi0.5Na0.5TiO3-xBaTiO3无铅压电陶瓷,研究了BaTiO3对陶瓷介电﹑压电﹑铁电及热释电性能的影响。X射线衍射仪(XRD)及扫描电子显微镜(SEM)分析表明,适量的BaTiO3能完全固溶到Bi0.5Na0.5TiO3陶瓷中,当BaTiO3含量为0.05<x<0.09时,(1-x)Bi0.5Na0.5TiO3-xBaTiO3陶瓷处于三方四方两相共存状态,形成了准同型相界(MPB)。在MPB处,陶瓷的介电﹑压电、铁电及热释电性能均达到最佳:d 33~170pC/N,εr^869,k p^27%,P r^32.91μC·cm^-2,E c^26.5kV·cm^-1,p^2.01×10^-8 Ccm^-2·℃^-1,F V^1.81×10^-2 m 2·C^-1,F D^0.82×10^-5 Pa^-1/2。对阻抗频率特性的研究发现,BaTiO3的加入能使材料性能“软化”。研究还发现适量BaTiO3的加入能促使BNT压电陶瓷的退极化温度向高温方向移动,93Bi0.5Na0.5TiO3-7BaTiO3陶瓷在80℃开始由铁电相向反铁电相转变。Lead-free(1-x)Bi 0.5 Na 0.5 TiO 3-x BaTiO 3 piezoelectrics were fabricated using a conventional solid-state reaction method.The effects of BaTiO 3 on dielectric,piezoelectric,ferroelectric and pyroelectric properties of(1-x)Bi 0.5 Na 0.5 TiO 3-x BaTiO 3 were investigated.Characterizations of the products show that a moderate amount of BaTiO 3 can completely dissolved in Bi 0.5 Na 0.5 TiO 3 ceramics,the morphotropic phase boundary between rhombohedral and tetragonal exists in the range of 0.05<x<0.09 and exhibits optimum properties of d 33~170 pC/N,εr^869,k p^27%,P r^32.91μC·cm^-2,E c^26.5 kV·cm^-1,p^2.01×10^-8 Ccm^-2·℃^-1,F V^1.81×10^-2 m^2·C^-1,F D^0.82×10^-5 Pa^-1/2.The study of the Impedance-Frequency characteristic shows that BaTiO 3 can soften the material s performance.Studies also find that suitable addition of BaTiO 3 can promote the depolarization temperature to move towards high temperature.93Bi 0.5 Na 0.5 TiO 3-7BaTiO 3 ceramics begin to shift from ferroelectric to anti-ferroelectric at 80℃.

关 键 词：压电性能 铁电性能 热释电性能 Bi0.5Na0.5TiO3 

分 类 号：TM282[一般工业技术—材料科学与工程]