温度和电场对纳米晶钛酸钡陶瓷铁电性的影响  

Temperature and applied field effect on ferroelectric properties of nanocrystalline BaTiO_3 ceramics

作　　者：刘佳[1] 杨仁波[1] 邓湘云[1,2] 李德军[1] 张小龙[1] 王传方[1] 王依山[1] 杨学良[1] 王晓慧[3] 李龙土[3] 

机构地区：[1]天津师范大学物理与电子信息学院,天津300387 [2]海南大学材料与化工学院,热带岛屿资源先进材料教育部重点实验室,硅锆钛资源综合开发与利用海南省重点实验室,海南海口570228 [3]清华大学材料科学与工程系,新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《功能材料》2012年第24期3364-3367,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50872093);国家高技术研究发展计划(863计划)资助项目(2012AA03A610);国家重点基础研究发展计划(973计划)资助项目(2002CB613301)

摘　　要：100nm是介于微米晶和纳米晶之间的重要临界尺寸,研究了平均晶粒尺寸为100nm的钛酸钡(BTO)陶瓷的微结构和铁电性能,分析了测试温度和外加电场对纳米晶钛酸钡陶瓷铁电性的影响。与超细纳米晶BTO陶瓷不同的是,100nm BTO陶瓷主要以四方相形式存在的;介电温谱显示,正交到四方相的相变具有典型的弥散特征,低温时介电损耗<0.02。此外,铁电性能测试表明,100nm BTO陶瓷具有良好的铁电滞后特征,随着电场的增加,能量损耗密度、剩余极化强度和矫顽场均增加;随着温度的升高,陶瓷的铁电性在逐渐减弱,高于居里温度时由铁电相转为顺电相,铁电性消失。实验结果表明,100nm BTO陶瓷的铁电性与测试温度和外加电场有着密切的关系。100nm is the crucial size between the micron-crystalline and the ultrafine nanocrystalline in BaTiO3 ceramics.Microstructure and ferroelectric properties were analyzed for 100nm BTO ceramics.Extrinsic temperature and applied field effects on ferroelectricity of BTO ceramics were studied in this paper.Different from ultrafine nano-crystalline BTO ceramics,tetragonal is the main phase;from the curves of ε-T,there is typical dispersion characteristics in orthorhombic to tetragonal phase transition,and the loss tangent（tanδ） is lower than 0.02.Moreover,the results indicated that,there is well ferroelectric hysteresis quality in BTO ceramics,with the increase of field,the energy loss density,Pr and Ec are increasing;however,ferroelectricity is reducing with the growth of temperature,when the temperature higher than Curie temperature,the ferroelectric phase shift to paraelectric phase,and there is disappearing of ferroelectric phase.Therefore,ferroelectricity is closely associated with the temperature and field.

关 键 词：铁电性 纳米晶钛酸钡陶瓷 温度 电场 

分 类 号：TN305[电子电信—物理电子学]