旋甩快淬带ErCoSi的各向异性磁热效应  

Anisotropic magnetocaloric effect of spin-spinning fast-quenched ErCoSi ribbons

作　　者：张艳 胡季帆 赵同云 莫兆军 曹博宇 尚颖琦 ZHANG Yan;HU Jifan;ZHAO Tongyun;MO Zhaojun;CAO Boyu;SHANG Yingqi(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shanxi Province Key Laboratory of Magnetic and Electric Functional Materials and Their Applications,Taiyuan University of Science and Technology,Taiyuan 030024,China;Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China)

机构地区：[1]太原科技大学材料科学与工程学院,太原030024 [2]太原科技大学磁电功能材料及应用山西省重点实验室,太原030024 [3]中国科学院赣州创新研究院,赣州341119

出　　处：《功能材料》2022年第12期12152-12156,共5页Journal of Functional Materials

基　　金：国家自然科学基金(52171195);山西省高等学校科技创新计划项目(2021L304);材料合成与加工先进技术国家重点实验室(武汉理工大学,2022-KF-32)。

摘　　要：磁制冷技术的关键在于磁热效应材料的发展。具有各向异性磁热效应的新型磁制冷材料可以用于旋转磁制冷技术而被广泛研究。研究了ErCoSi旋甩快淬带化合物的磁性、磁热效应及磁各向异性。在T_(c)=5.5 K处发生了铁磁(FM)到顺磁(PM)的二级相变。通过分析5 m/s-ErCoSi快淬带在磁场∥和⊥横截面的两个方向的等温磁化曲线、磁熵变和磁制冷能力可知,在μ0H=0~5 T的磁场变化时,磁场∥和⊥快淬带横截面的最大磁熵变值-ΔS M分别为17.5 J·kg^(-1)k^(-1)和12 J·kg^(-1)k^(-1);制冷能力分别可达230 J·kg^(-1)和120 J·kg^(-1).表明5 m/s-ErCoSi快淬带具有大的磁热效应和明显的磁各向异性,有望实现旋转样品磁制冷技术.The performance of magnetocaloric effect materials is one of the key factors restricting the development of magnetic refrigeration technology.Materials with anisotropic magnetocaloric effect can be used in rotary magnetic refrigeration technology,which is beneficial to the simplification of refrigeration devices.In this paper,the magnetic properties,magnetocaloric effects and magnetic anisotropy of rapidly quenched ErCoSi compounds are investigated.ErCoSi undergoes a second-order phase transition from ferromagnetic(FM)to paramagnetic(PM)at T_(c)=5.5 K.XRD shows that ErCoSi has a preferred orientation in(211)direction.In order to obtain a large magnetocaloric effect and to determine the effect of preferred orientation on magnetism and magnetocaloric effect,the isothermal magnetization curves in the directions of H∥and⊥cross section around the Curie temperature were analyzed.The corresponding magnetic entropy change(-ΔS_(M))and magnetic refrigeration capacity(RC)were calculated.Under the magnetic field changed from 0-5 T,the values of-ΔS M in the directions of H∥and⊥cross section were 17.5 J/kg k and 12 J/Kg K,respectively,and corresponding values of RC were 230 J/kg and 120 J/kg,respectively.The value of-ΔS_(M)reaches 12 J/kg k even atμ_(0)H=0-2 T in the directions of H∥cross section.It was obvious that ErCoSi fast quenching belt showed a large low-field magnetocaloric effect and obvious magnetic anisotropy,which was expected to realize the magnetic refrigeration technology of rotating samples.

关 键 词：磁热效应 磁制冷材料 磁熵变 

分 类 号：TG32.2[金属学及工艺—金属压力加工]