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

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.