质量比为0.2%ZnO掺杂Ba_(0.2)Sr_(0.8)TiO_3与Ba_(0.2)Sr_(0.8)TiO_3陶瓷的结构和变温变频复介电常数的对比测量分析  

Analyses of the Ceramics Structure of 0.2%ZnO Doped into Ba_(0.2)Sr_(0.8)TiO_3 Compared with Ba_(0.2)Sr_(0.8)TiO_3 and the Complex Permittivity ε* in the Condition of Scanning Temperatures and Frequencies

作　　者：苏欣[1] 尹红梅[1] 周树银[1] 马学静[1] 张海珠[1] 黄以能[1,2] 

机构地区：[1]伊犁师范学院新疆凝聚态相变与微结构实验室,新疆伊宁835000 [2]南京大学物理系国家固体微结构重点实验室,江苏南京210093

出　　处：《伊犁师范学院学报（自然科学版）》2011年第4期20-24,共5页Journal of Yili Normal University：Natural Science Edition

基　　金：新疆自治区科技厅高技术研究发展项目(200916126);新疆自治区科技厅自然基金(2009211B16;200821184);伊犁师范学院院级项目(2008YB005)

摘　　要：采用固相反应方法合成了(1-x%)Ba0.2Sr0.8TiO3+x%ZnO(x=0,0.2)陶瓷材料,并分别用X射线衍射和变温变频介电谱方法,对它们的结构和复介电常数进行了对比测量分析.结果表明,质量比为0.2%ZnO的掺杂:(1)对样品的室温晶系类型没有影响,仍然为立方晶系,晶格常数仅仅减小了0.18%;(2)弥散铁电相变的相变温度由未掺杂的136K向高温移动至140K;(3)低温铁电相的复介电常数的实部ε'减小而虚部ε"增加,高温顺电相的ε'和ε"几乎不变;(4)样品中弥散铁电相变过程的ε"与测量频率f几乎无关;(5)样品中出现在高温区的离子扩散过程向低温移动.（1-x%）Ba02Sr0.8TiO3＋x%ZnO （x=0, 0.2） ceramics were prepared by the method of solid state reactions, and comparative measurements and analyses of their structure and complex permittivity ε＊ by X-ray diffractions and dielectric spectra of scanning temperatures and frequencies, respectively. The results show that with 0.2%ZnO doped into Bao.2Sr0.8TiO3： （1）the room-temperature crystal structure does not change, still being the cubic system, and the lattice parameter only decreases 0.18%; （2） the diffusive ferroelectric phase transition temperature shifts from 136K to 140K; （3）the real part ε＇of ε＊of the low temperature ferroelectric phase decreases while the imaginary part ε″ increases, but they change only little in the high temperature paraelectric phase; （4）it induces ε″ during the diffusive ferroelectric phase transition being independent of measuring frequency f, and （5） it also induces the high temperature ionic diffusion process shifting to low temperatures.

关 键 词：铁电陶瓷 掺杂 固相反应 介电谱 X射线衍射 

分 类 号：TM28[一般工业技术—材料科学与工程]