面向高效固态制冷应用的铁电陶瓷材料

Ferroelectric Ceramics for High-Efficient Solid-State Refrigeration

近10年来,基于电卡效应的铁电制冷技术成为铁电研究领域的新兴热点之一。电卡效应指通过施加或移去电场使铁电体等电介质材料产生绝热温变或等温熵变的物理现象。铁电制冷由于具有能量效率高、器件结构简单、易于小型化、操控便捷、成本低廉、环境友好等诸多优点,被认为是一种有巨大发展潜力的新型高效固态制冷技术。本文首先简要介绍了电卡效应的研究背景,回顾了其发展历程,之后以提升电卡性能的两大关键因素(即热释电系数和击穿场强)为主线,介绍了近年来不同体系、不同类型铁电材料电卡效应的典型研究成果,最后对电卡制冷研究与应用的发展进行了总结与展望。

In the recent decade,the ferroelectric refrigeration technology based on electrocaloric effect(ECE)has become one of the emerging hotspots in the field of ferroelectric researches.ECE refers to a reversible adiabatic temperature change and/or isothermal entropy change when an electric field is applied on or withdrawn from a dielectric material,especially ferroelectrics.Ferroelectric refrigeration is regarded as a promising candidate for the highly-efficient solid-state refrigeration due to advantages of high energy efficiency,simple device structure,easy miniaturization,convenient manipulation,low cost,and environmental friendliness.Firstly,this paper briefly introduces the application background and reviews the history of ECE researches.And then,taken the pyroelectric coefficient and dielectric strength as two dominant factors to enhance ECE,it reviews recent ECE researches for different material systems and different types of sample.Finally,some summary and prospect are proposed for further development and practical application of ECE.