摘要
采用固相合成法和常压烧结法制备了(1-x)(Na_(0.5)Bi_(0.5))_(0.94)Ba_(0.06)TiO_3-xSnO_2(BNBTS,x=0.00-0.04)粉体和陶瓷,采用XRD、SEM和电性能测试手段对BNBTS陶瓷结构、铁电性能、压电性能和介电性能进行了分析,结果发现,添加不同量的SnO_2的陶瓷样品都形成了单一的钙钛矿结构;SEM图片显示,随着Sn O_2的加入,晶粒尺寸减小,晶粒尺寸分布更均匀;电学性能测试结果表明,SnO_2的加入明显改变了BNBTS陶瓷的电学性能,随着x的增大,Pr先增大后减小,在x=0.03时,Pr达到最大值36.5μC/cm^2,但x在0.01到0.03之间变化时,剩余极化强度Pr变化不明显,而矫顽场Ec则呈减小趋势;压电常数d_(33)随着x的增大先增大后减小,在x=0.02时,达到最大值134μC/N;各样品具有典型铁电体所具有的"蝴蝶状"的双向应变曲线,随着SnO_2含量的增加,负向应变减小,正向应变变大。随着SnO_2的加入,BNBTS陶瓷的室温介电常数变大,并表现出弛豫特性,在x=0.03时BNBTS陶瓷室温下的介电常数达到最大值1143。
BNBTS lead free piezoelectric ceramics were prepared by the solid-phase reaction method.The effect of SnO2 on the structure and electrical properties of the samples were studied by XRD,SEM and the method for electrical properties testing. The results showed that the dopant of SnO2 did not change the perovsike structure,but decreased the lattice parameters;the SEM diagrams showed that the grain sizes of BNBTS ceramics decrease while their grain size distributions were more uniform with the addition of SnO2. The ferroelectric properties have been affected with the dopant of SnO2,the remnant polarization Pr increased firstly and then decreased,and the overall trend of coercive field Ec was downward,Pr attained the maximum values of 36.5 μC/cm2 as x=0.03;the sample had the highest piezoelectric coeffiecient(d33=134 pC/N)when x =0.02;all samples exhibited the typical ferroelectric behavior with butterfly shaped strain hysteresis loop,with the increase of SnO2 content,the negative strain decreases and positive strain increases;the relative dielectric constants of BNBTS ceramics at room temperature increased,attained the peak value of 1143 as x = 0.03,and all BNBTS ceramics exhibit the typical relaxor behavior.
作者
孙力
李若男
陈维鑫
颜梦涵
樊震坤
杨东亮
李晓东
付鹏
Sun Li;Li Ruonan;Chen Weixin;Yan Menghan;Fan Zhenkun;Yang Dongliang;Li Xiaodong;Fu Peng(School of Materials Science and Engineering,Liaocheng University,Liaocheng 252059,China;Shandong Guiyuan Advanced Ceramics Co.,Ltd.,Zibo 255086,China)
出处
《山东陶瓷》
CAS
2019年第1期8-12,共5页
Shandong Ceramics
基金
中国博士后科学基金(2017M622196)
山东省高等学校科研计划项目(J17KA005)
中科院重点实验室开放课题项目(KLIFMD201705)
聊城大学大学生科技文化创新基金(26312171927)
大学生创新创业训练计划项目基金(CXCY2018090)等项目支持下完成
