摘要
The magnetocaloric(MC) effect-based solidstate magnetic refrigeration(MR) technology has been recognized as an alternative novel method to the presently commercialized gas compression technology. Searching for suitable candidates with promising MC performances is one of the most urgent tasks. Herein, combined experimental and theoretical investigations on the magnetic properties, magnetic phase transition, and cryogenic MC performances of Gd Fe_(2)Si_(2)have been performed. An unstable antiferromagnetic(AFM) interaction in the ground state has been confirmed in Gd Fe_(2)Si_(2). Moreover, a huge reversible cryogenic MC effect and promising MC performances in Gd Fe_(2)Si_(2)have been observed.The maximum isothermal magnetic entropy change, temperature-averaged entropy change with 2 K lift, and refrigerant capacity for Gd Fe_(2)Si_(2)were 30.01 J kg^(-1)K^(-1),29.37 J kg^(-1)K^(-1), and 328.45 J kg^(-1)at around 8.6 K with the magnetic change of 0–7 T, respectively. Evidently, the values of these MC parameters for the present AFM compound Gd Fe_(2)Si_(2)are superior to those of most recently reported rareearth-based MC materials, suggesting the potential application for active cryogenic MR.
基于磁性材料相变过程中伴随的磁热效应而发展起来的磁制冷技术因其绿色环保和高效节能等优点而被广泛关注.高性能磁制冷工质材料的探索一直是本领域的研究热点也是难点之一.本文中,我们通过实验研究结合第一性原理计算,对GdFe_(2)Si_(2)化合物的晶体结构、磁性、磁相变以及低温磁热效应进行了系统研究,结果表明GdFe_(2)Si_(2)化合物基态为反铁磁且具有大的低温可逆磁热效应.在0–7 T的磁场变化下,其磁制冷参数包括等温磁熵变最大值和制冷能力分别高达30.01 J kg^(-1)K^(-1)和328.45 J kg^(-1).这些磁制冷参数优于大多数目前已报道的同温区高性能稀土基磁制冷材料,表明反铁磁GdFe_(2)Si_(2)化合物在低温磁制冷领域同样具有潜在的应用前景.
作者
Yikun Zhang
Jian Zhu
Shuo Li
Zhenqian Zhang
Jiang Wang
Zhongming Ren
张义坤;朱剑;李硕;张振乾;王江;任忠鸣(School of Electronics and Information Engineering,Hangzhou Dianzi University,Hangzhou 310012,China;State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Key Laboratory of Novel Materials for Sensor of Zhejiang Province,Hangzhou Dianzi University,Hangzhou 310012,China)
基金
financially supported by the National Natural Science Foundation of China (52071197)
the “Pioneer” and “Leading Goose” R&D Program of Zhejiang (2022C01230)
the Science and Technology Committee of Shanghai Municipality (19ZR1418300 and 19DZ2270200)
the Independent Research and Development Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University (SKLASS 2021-Z05)。
