摘要
液氦温区制冷在高新技术产业、航空航天事业以及探索科学前沿等领域发挥着重要的战略作用。磁制冷具有内禀高效、不依赖液氦与重力等优势,因而在低温制冷领域备受关注。磁制冷材料是磁制冷系统的核心,开发具有低磁场驱动大磁热效应的磁制冷材料是推动磁制冷技术应用的关键。EuTiO_(3)在液氦温度附近表现出可观的磁热效应,是一种潜在的液氦温区磁制冷材料。同时,EuTiO_(3)中反铁磁超交换和铁磁性相互作用的微妙平衡为其磁性与磁热效应调控提供了可行性。通过元素取代诱导晶格膨胀、引入巡游电子或氧空位等是驱动EuTiO_(3)由反铁磁到铁磁基态转变的有效方法,有助于获得低磁场驱动的大磁热效应。本文简要介绍了液氦温区磁制冷材料的发展概况,概述了EuTiO_(3)的磁性与磁热效应,详细阐述了EuTiO_(3)基磁制冷材料的研究进展,并对该系列材料的未来研究方向和发展趋势进行了展望。
Refrigeration in the liquid helium temperature range plays a strategic role in fields of high-tech industry,aerospace and exploration of the frontiers of science.Magnetic refrigeration is of great interests in the field of cryogenic refrigeration because of its inherently high efficiency as well as its independence from liquid helium and gravity.Magnetic refrigeration material is the core of a magnetic refrigeration system,and developing magnetic refrigeration materials with a large magnetocaloric effect(MCE)driven by a low magnetic field is the key to promoting the application of magnetic refrigeration.EuTiO_(3)exhibits a considerable MCE near liquid helium temperature and is a potential magnetic refrigerant in the liquid helium temperature range.Besides,the delicate balance of antiferromagnetic super-exchange and ferromagnetic interactions in EuTiO_(3)provides the feasibility of regulating its magnetism and MCE.Inducing lattice expansion,introducing itinerant electrons or oxygen vacancies by elemental substitution is an effective approach to drive the transition of EuTiO_(3)from antiferromagnetic to ferromagnetic ground state,which facilitates the obtaining of a large low-field MCE.This paper begins with a brief overview of the development of magnetic refrigeration materials operating in the liquid helium temperature range.Then,the magnetism and MCE of EuTiO_(3)are introduced,and the research progress of EuTiO_(3)-based magnetic refrigeration materials is elaborated in detail.Finally,the future research direction and development tendency of this series of materials are prospected.
作者
谢慧财
莫兆军
沈俊
沈保根
XIE Hui-cai;MO Zhao-jun;SHEN Jun;SHEN Bao-gen(Key Laboratory of Rare Earths,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Bejing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China)
出处
《稀土》
北大核心
2025年第3期1-19,共19页
Chinese Rare Earths
基金
国家杰出青年科学基金项目(51925605)
国家自然科学基金面上项目(52171195)
江西省高层次高技能领军人才培养项目
中国科学院稀土重点实验室基础研究项目。
关键词
EuTiO_(3)
磁制冷材料
液氦温区
磁热效应
磁熵变
EuTiO_(3)
magnetic refrigeration material
liquid helium temperature range
magnetocaloric effect
magnetic entropy change
