钛酸铋系中与铁电性能有关的缺陷及其弛豫研究的进展  

PROGRESS IN STUDY OF DEFECT AND ITS RELAXATION ASSOCIATED WITH FERROELECTRIC PROPERTIES IN BISMUTH TITANATE-BASED FERROELECTRICS

作　　者：朱劲松[1] 李伟[1] 陈恺[1] 吕笑梅[1] 王业宁[1] 

机构地区：[1]南京大学固体微结构物理国家重点实验室,南京210093

出　　处：《物理学进展》2006年第3期351-358,共8页Progress In Physics

基　　金：国家自然科学基金(50672034;90401014;10021001;10574066);国家973项目(2002CB613303);江苏省自然科学基金(No.BK2004084)

摘　　要：本文概括的介绍了近年来我们利用内耗和介电的方法研究铋系铁电材料的一些结果。钛酸铋系铁电体作为一种无铅材料在铁电存储中有着重要的应用,通过对其内部与氧空位有关的力学和电学弛豫行为的测量,并进一步通过对氧空位弛豫及关联行为的研究,揭示了钛酸铋系铁电材料中掺杂、微结构以及铁电性能之间内在的联系。这些结果从微观的角度阐述了影响铁电体剩余极化与铁电疲劳的因素,对于指导并优化现有铁电体的铁电性能有着重要的意义。此外,还报道了对铁电畴、相变等的研究结果,表明力学与介电方法是研究铁电性能及澄清机理的有效手段。This article reviewed the recently achieved results in our group addressing the investigation of bismuth layered ferroelectrics by internal friction techniques and dielectric measurements. By investigating the mechanical and electrical relaxation behavior associated with migration of oxygen vacancies inside ferroelectrics, the relationship between ferroelectric properties and doping effect as well as microstructures inside was revealed. From a microscopic point of view, these results illustrate the factors accounting for ferroelectric polarization and fatigue, which shows potential significant in guiding the optimization of ferroelectric properties in existing materials. Additionally, results associated with ferroelectric domain and phase transition etc. were briefly discussed, illustrating that internal friction and dielectric measurement are an effective method in studying ferroelectric properties and clarifying mechanisms correspondingly.

关 键 词：钛酸铋 内耗与介电 氧空位 铁电畴 弛豫与关联 

分 类 号：O482.5[理学—固体物理]