相变调控、磁热效应和反常热膨胀  

Phase transition regulation, magnetocaloric effect, and abnormal thermal expansion

作　　者：林源 胡凤霞[1,3,4] 沈保根 Lin Yuan;Hu Feng-Xia;Shen Bao-Gen(State Key Laboratory of Magnetism,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]中国科学院物理研究所,磁学国家重点实验室,北京100190 [2]中国科学院宁波材料技术与工程研究所,宁波315201 [3]中国科学院大学物理科学学院,北京100049 [4]松山湖材料实验室,东莞523808

出　　处：《物理学报》2023年第23期250-272,共23页Acta Physica Sinica

基　　金：国家自然科学基金委基础科学中心项目(批准号:52088101);国家自然科学基金(批准号:92263202,U23A20550,51971240);国家重点研发计划(批准号:2021YFB3501202,2019YFA0704900,2021YFA1400300,2022YFB3505201);中国科学院战略性先导科技专项B类(批准号:XDB33030200)资助的课题。

摘　　要：相变作为广泛存在于自然界中的一种现象很早就受到了广泛的关注,并且已经被应用于相变制冷、相变存储、相变储能和负热膨胀等领域中.基于磁热、电热和机械热效应不断发展起来的固态制冷技术具有环保、高效、低噪声和易小型化等优点,被视为替代汽压缩制冷的新型制冷技术.其中,磁热效应是研究历史最悠久的一种.然而,单磁场驱动磁热效应的诸多不足限制了其固态制冷应用,如热效应幅度不够高、滞后损耗大、制冷温跨窄等,因此多场调控和多卡效应应运而生.本文主要介绍笔者团队近期开展的多场调控磁热效应、以及磁热材料的反常热膨胀行为的研究.As a common phenomenon in nature,phase transition has received much attention for a long time.It has been applied to various fields,such as refrigeration,information and energy storage,and negative thermal expansion.Solid refrigeration technology based on magnetocaloric effect,electrocaloric effect,and mechanocaloric effect has the advantages of environmental protection,high efficiency,no noise,and easy miniaturization,and is expected to replace vapor compression technology.Among them,the magnetocaloric effect has the longest research history.However,the shortcomings of magnetocaloric effect driven by a single magnetic field limit its solid-state refrigeration application,such as insufficient amplitude of caloric effect,large hysteresis loss,and narrow refrigeration temperature span.To solve these problems,multifield tuning and multicaloric effect have come into people's sight.This paper introduces our recent research on improving the caloric effect by applying multifield,such as increasing entropy change,expanding transition temperature range,adjusting transition temperature,and reducing hysteresis losses.The thermodynamics of multifield and coupled-caloric effect are presented in the meantime.On the other hand,materials with abnormal thermal expansion(zero thermal expansion,negative thermal expansion)have important applications in precision manufacturing.The phase transition and lattice effect dominated by magnetic atoms in the giant magnetocaloric materials with strong magnetic-crystal coupling provide an ideal platform for exploring abnormal thermal expansion.This paper also introduces our recent research on abnormal thermal expansion in magnetocaloric materials,and looks forward to future relevant research.

关 键 词：相变调控 磁热效应 耦合热效应 反常热膨胀 

分 类 号：TB34[一般工业技术—材料科学与工程]