有色金属科学与工程2026，Vol.17Issue(4)：495-505,11.DOI:10.13264/j.cnki.ysjskx.2026.04.002
Er1-xTmxCr2Si2(0≤x≤0.4)低场驱动大磁熵变高性能磁制冷研究
Low-field-driven high-performance magnetic refrigeration with giant magnetic entropy change in Er1-xTmxCr2Si2(0≤x≤0.4)compounds
摘要
Abstract
The effect of Tm doping on the magnetic phase transition and magnetocaloric effect(MCE)of ErCr2Si2-based compounds were systematically investigated.A series of polycrystalline Er1-xTmxCr2Si2(0≤x≤0.4)samples were successfully synthesized by the arc-melting method.X-ray powder diffraction combined with Rietveld refinement indicated that all samples crystallized in the ThCr2Si2-type tetragonal structure with space group I4/mmm.It was found that with increasing Tm concentration,the saturation magnetization(MS)decreased from 7.7 μB(x=0)to 6.8 μB(x=0.4).Under a low magnetic field(Δμ0H)change of 0-1 T,the x=0.1 sample exhibited the optimal magnetocaloric performance,with maximum magnetic entropy change(-ΔSMmax)of 19.7 J/(kg·K),representing an enhancement of 18.7%compared with the reported undoped ErCr2Si2(-ΔSMmax=16.6 J/(kg·K)).Moreover,the saturation driving magnetic field HS corresponding to the magnetic entropy change decreased from 0.45 T to 0.4 T.Tm doping also significantly broadened the effective refrigeration operating temperature window(Tope).Under a magnetic field change of ∆μ0H=0-5 T,Tope expanded from 14.1 K(2-16.1 K)for x=0 to 17.3 K(2-19.3 K)for x=0.4,corresponding to an increase of approximately 22.7%.In addition,both the thermal hysteresis loss(ΔThys)and the average magnetic hysteresis loss(Wave)decreased with increasing Tm concentration,from 0.33 K and 2.28 J/kg at x=0 to 0.22 K and 0.89 J/kg at x=0.4,representing reductions of about 33.3%and 60.9%,respectively.Arrott plots,power-law critical exponent fitting,and the universal behavior of the reduced magnetic entropy change curves consistently demonstrated that this system exhibited typical second-order magnetic phase transition characteristics.Its small thermal and magnetic hysteresis losses were considered beneficial for practical applications in industrial magnetic refrigeration.关键词
ErCr2Si2基合金/低温磁制冷/低场大磁熵变/二级磁相变Key words
ErCr2Si2-based alloy/low-temperature magnetic refrigeration/giant magnetic entropy change under low magnetic field/second-order magnetic phase transition分类
矿业与冶金引用本文复制引用
李强,杜艳敏,王占林,方春生,马胜灿,罗小华,陈长材..Er1-xTmxCr2Si2(0≤x≤0.4)低场驱动大磁熵变高性能磁制冷研究[J].有色金属科学与工程,2026,17(4):495-505,11.基金项目
国家自然科学基金资助项目(52461033,52561035) （52461033,52561035）
江西省自然科学基金项目(20242BAB25206) （20242BAB25206）
江西省主要学科学术和技术带头人培养计划领军人才项目(20204BCJ22004) （20204BCJ22004）
江西省金属磁性材料与器件重点实验室项目(2024SSY05061) （2024SSY05061）
江西理工大学高层次人才科研启动项目(205200100567) （205200100567）
