摘要
近年来随着电子元器件的微型化趋势,电介质陶瓷材料的晶粒尺寸效应也受到了广泛的关注。本实验系统地研究了0.94Na0.5Bi0.5TiO3-0.06BaTiO3(NBT-6BT)陶瓷的晶粒尺寸效应,利用一步烧结与两步烧结法制备出晶粒尺寸为0.72~1.84μm的NBT-6BT陶瓷,研究了晶粒尺寸效应对陶瓷的晶体结构、介电、压电以及铁电性能的影响。结果表明,晶粒尺寸的变化会引起晶格常数的变化,并在晶粒尺寸为1.24μm时,结晶度最佳,相对介电常数与压电系数以及机电耦合系数分别达到最大值(εr=2405、d33=150 pC/N和Kp=29.5%)。NBT-6BT陶瓷的剩余极化强度Pr随晶粒尺寸的增大而提高,而矫顽场Ec呈现出相反的趋势。实验研究表明控制铁电材料的晶粒尺寸是获得优异的综合性能的有效手段。
With the trend of miniaturization of electronic components,the grain size effect of dielectric ceramics has been widely concerned in recent years.In this work,the grain size effect of 0.94Na0.5Bi0.5TiO3-0.06BaTiO3(NBT-6BT)ceramics was systematically investigated.A series of highly dense NBT-6BT ceramics with average grain size ranging from 0.72μm to 1.84μm were prepared by both traditional sintering and two-step sintering method.The effect of grain size on the crystal structure,dielectricity,piezoelectricity and ferroelectricity of ceramics were investigated.Experimental results show that lattice constant changes with the varying grain size.When the grain size is 1.24μm,the ceramics show the best crystallinity,along with the maximal values of the relative dielectric constant,piezoelectric coefficient and electromechanical coupling coefficient(εr=2405,d33=150 pC/N and Kp=29.5%).The residual polarization Pr of NBT-6BT ceramics have been raised with the increasing grain size,while the coercive field Ec exhibits an opposite trend.Experimental study shows that controlling the grain size of ferroelectric materials is an effective means to obtain excellent comprehensive properties.
作者
郑来奇
江向平
陈超
聂鑫
黄枭坤
涂娜
ZHENG Laiqi;JIANG Xiangping;CHEN Chao;NIE Xin;HUANG Xiaokun;TU Na(Jiangxi Key Laboratory of Advanced Ceramic Materials, School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第5期1600-1607,共8页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51562014,51762024,51862016)
江西省教育厅科技项目(GJJ170789,GJJ170804)。
关键词
NBT-6BT
晶粒尺寸
介电
压电
铁电
NBT-6BT
grain size
dielectricity
piezoelectricity
ferroelectricity
作者简介
郑来奇(1993-),男,硕士研究生,主要从事功能陶瓷及应用方面的研究,E-mail:2532336565@qq.com;通讯作者:江向平,博士,教授,E-mail:jiangxp@163.com。
