摘要
为了优化人工复合铁电薄膜的性能,建立三种材料复合而成的新型铁电薄膜的理论模型,采用Ginzburg-Landau-Devonshire(GLD)唯象理论,三种组元间采取不同的复合方式,同时引入一个分布函数来描述它们之间过渡层的性质,在不同的复合方式下,重点对复合铁电薄膜的极化性质展开了研究。研究表明复合方式的变化引起了薄膜内部极化强度分布的显著变化,该复合薄膜的平均极化强度随温度的变化与体材料的相应关系有显著区别。随着温度的逐渐升高,在未达薄膜相变温度前,平均极化强度出现了一处突降,这一性质在复合铁电薄膜热释电性质及其器件的应用上有十分重要的意义。
In order to improve properties of composite ferroelectric thin films, a new theoretical model of three com- ponents for ferroelectric thin film has been built. Using Ginzburg-Landau-Devonshire（GLD） theory, a local distri- bution function has been introduced to describe the properties of the transition layers. Changing the composite meth- ods of the three components, polarization properties of the film have been investigated. It＇ s shown that different composite methods lead to obvious change of polarization distribution, and the relationship between the mean polari- zation and temperature behaves obviously different when compared with that of bulk material. With the increase of temperature, there is a sudden decrease of mean polarization before the transition temperature of films. This proper- ty will have great significance on pyroelectric properties and applications of ferroelectric thin films.
出处
《黑龙江大学自然科学学报》
CAS
北大核心
2012年第3期407-411,共5页
Journal of Natural Science of Heilongjiang University
基金
国家自然科学基金资助项目(10647138)
辽宁省科研基金资助项目(20060667)
关键词
铁电薄膜
自发极化
相变温度
ferroeleetric thin film
spontaneous polarization
phase-transition temperature
