【摘要】 概括介绍了铁电致冷基本原理，给出了三种电生热效应，即线性电生热效应、二次电生热效应和电场诱导一级相变型电生热效应的表达式，测量了（１－ｘ）Ｐｂ（Ｍｇ１／３Ｎｂ２／３）Ｏ３ｘＰｂＴｉＯ３［简记为（１－ｘ）ＰＭＮｘＰＴ］，当ｘ＝００８，０１０和０２５时在室温附近的电生热性能，分析了其电生热效应的起源．研究结果表明，（１－ｘ）ＰＭＮｘＰＴ铁电固溶体陶瓷在室温附近具有较大的电生热效应；该效应起源于电场诱导一级相变型电生热效应和线性电生热效应；该系列陶瓷可望用于室温附近多级铁电致冷更多还原

【Abstract】 AbstractIn recent years, the electrocaloric effect （abbr. ECE） of dielectrics has attracted attention for ferroelectric refrigerating application. The fundamentals of ferroelectric refrigeration and the expressions of three types of ECEs, i.e., linear, quadratic and fieldinduced firstorder phase transition electrocaloric effects, are presented in this paper. The ECE properties of （1-x）PbMg1/3Nb2/3O₃ xPbTiO₃[abbr. （1-x）PMN xPT] ferroelectric ceramics（x=0.08, 0.10, and 0.25 respectively） at room temperature were measured and analyzed. It is found that the large electrocaloric effect of （1-x）PMN xPT ferroelectric ceramics about room temperature is due to the electric induced first order phase transition and linear electrocaloric effects, and these ceramics could be used in ferroelectric multi stage refrigeration.更多还原