TmNi_(2)Si_(2)化合物中不稳定的反铁磁性和大的可逆磁热效应  

Unstable antiferromagnetism and large reversible magnetocaloric effect in TmNi_(2)Si_(2)

作　　者：田路 许博 陈欢 莫兆军 李振兴 刘国栋 沈俊 Lu Tian;Bo Xu;Huan Chen;Zhaojun Mo;Zhenxing Li;Guodong Liu;Jun Shen(Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China;School of Rare earths,University of Science and Technology of China,Hefei 230026,China;School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,China;Department of Energy and Power Engineering,School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China [2]School of Rare earths,University of Science and Technology of China,Hefei 230026,China [3]School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,China [4]Department of Energy and Power Engineering,School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Science China Materials》2023年第10期3984-3990,共7页中国科学（材料科学（英文版）

基　　金：supported by the National Key Research and Development Program of China(2022YFB3505101);the National Science Foundation for Excellent Young Scholars(52222107);the National Science Foundation for Distinguished Young Scholars(51925605);the Research Projects of Ganjiang Innovation Academy,Chinese Academy of Sciences(E055B002);the Doctoral Postgraduate Innovation Funding project of Hebei Province(CXZZBS2023032)。

摘　　要：基于实验和理论结果,我们对TmNi_(2)Si_(2)化合物的磁性,磁相变和磁热效应进行了研究.TmNi_(2)Si_(2)化合物被证实存在不稳定的反铁磁相互作用,并在超过0.2 T的外加磁场下发生从反铁磁到铁磁的场驱动变磁转变.此外,大的可逆低温磁热效应也被观察到.在0-2 T的变化磁场下,最大磁熵变和制冷量分别为15.4 J kg^(-1)K^(-1)和68.0 J kg^(-1).因此,低磁场下大的可逆磁热效应表明TmNi_(2)Si_(2)化合物在低温磁制冷机中具有潜在的应用前景.Based on experimental and theoretical results,the magnetic properties,magnetic phase transitions,and magnetocaloric effect(MCE)of TmNi_(2)Si_(2) were studied.In this study,we confirmed that unstable antiferromagnetic interaction underwent a field-induced phase transition from metamagnetic to ferromagnetic under magnetic fields exceeding 0.2 T in TmNi_(2)Si_(2).Moreover,a large reversible cryogenic MCE was observed.The maximum magnetic entropy change(-ΔSM max)and refrigeration capacity were found to be 15.4 J kg^(-1) K^(-1) and 68.0 J kg^(-1),respectively,when changing the magnetic field from 0 to 2 T.The large reversible MCE observed under the low magnetic field change indicates the potential application of TmNi_(2)Si_(2) in cryogenic magnetic refrigerators.

关 键 词：magnetic properties magnetocaloric effects cryogenic magnetic refrigeration magnetic phase transition TmNi_(2)Si_(2)compound 

分 类 号：TB64[一般工业技术—制冷工程]