Giant low-field magnetocaloric effect in unstable antiferromagnetic Tm_(1-x)Er_(x)Ni_(2)Si_(2)(x=0.2,0.4)compounds  

作　　者：Bo Xu Lu Tian Junfeng Wang Mei Wu Xinqiang Gao Zhenxing Li Jun Shen 

机构地区：[1]School of Rare Earths,University of Science and Technology of China,Hefei,230026,China [2]Key Laboratory of Rare Earths,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,341119,China [3]Department of Energy and Power Engineering,School of Mechanical Engineering,Beijing Institute of Technology,Beijing,100081,China

出　　处：《Journal of Rare Earths》2025年第2期312-318,I0003,共8页稀土学报(英文版)

基　　金：Project supported by the National Key Research and Development Program of China(2021YFB3501204);the National Natural Science Foundation of China(52171054);the National Science Foundation for Distinguished Young Scholars(51925605);the National Science Foundation for Excellent Young Scholars(52222107)。

摘　　要：Magnetic refrigeration(MR)technology is regarded as an ideal solution for cryogenic applications,relying on magnetocaloric materials which provide necessary chilling effect.A series of polycrystalline Tm_(1-x)Er_(x)Ni_(2)Si_(2)(x=0.2,0.4)compounds was synthesized,and their magnetic properties,magnetic phase transition together with magnetocaloric effect(MCE)were studied.The Tm_(1-x)Er_(x)Ni_(2)Si_(2)(x=0.2,0.4)compounds display a field-induced metamagnetic transition from antiferromagnetic(AFM)to ferromagnetism(FM)in excess of 0.2 T,respectively.Meanwhile,the AFM ground state is unstable.Under the field change of 0-2 T,the values of maximal magnetic entropy change(-ΔS_(M)^(max))and refrigerant capacity(RC)for Tm_(0.8)Er_(0.2)Ni_(2)Si_(2)compound are 17.9 J/(kg·K)and 83.5 J/kg,respectively.The large reversible MCE under low magnetic fields(≤2 T)indicates that Tm_(0.8)Er_(0.2)Ni_(2)Si_(2)compound can serve as potential candidate materials for cryogenic magnetic refrigeration.

关 键 词：Magnetocaloric materials Magnetocaloric effects Cryogenic magnetic refrigeration TmNi_(2)Si_(2) Rare earths 

分 类 号：TG1[金属学及工艺—金属学]