【摘要】 从铁电薄膜和铁电颗粒两大方面回顾了处理尺寸效应的理论研究方法(包括宏观的热力学唯像理论、微观的横场Ising模型和第一性原理计算)和铁电相变临界尺寸的理论预测.总结了从50年代以来实验中观测到的各种铁电材料的临界尺寸,简单介绍了铁电纳米陶瓷的一些尺寸效应,并叙述了近几年才开始报道的铁电纳米线中的铁电相变.最后指出了目前研究现状中存在的一些问题.更多还原

【Abstract】 Theoretical approaches(such as macroscopic thermodynamics phenomenological approach, microscopic transverse field Ising model and first-principles calculation)in dealing with size effect and predicts on critical size of ferroelectric phase transition are reviewed from two aspects,ferroelectric film and ferroelectric grain,respectively.Critical sizes of some ferroelectrics observed in experiments are summarized from 1950s.Some size effects of ferroelectric ceramics are introduced simply.Ferroelectric phase transitions of ferroelectric nanowires reported recently are narrated too.Finally,some problems in researching progress are pointed out.更多还原