Gd7Pd3-xFex合金磁性及磁热效应的研究  

Magnetic and Magnetocaloric Properties of Gd7Pd3-xFex

作　　者：李昆 王芳贵 吴葆春 杜红林[1] 杨金波[1] 王常生[1] Li Kun;Wang Fanggui;Wu Baochun;Du Honglin;Yang Jin bo;Wang Changsheng(School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]北京大学物理学院,北京100871

出　　处：《中国稀土学报》2020年第1期40-45,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(11675006,51731001,11805006);国家重点研究发展计划项目基金(2017YFA0206303,2016 YFB0700901,2017YFA0403701)资助。

摘　　要：采用电弧熔炼和高温退火的方法制备了Gd7Pd3-xFex(x=0, 0.2, 0.5, 0.8和1)合金材料,并对该系列合金材料的磁特性及磁热效应进行了研究。X射线粉末衍射研究表明,所有的材料均形成Th7Fe3型结构。并且随着x的增大,晶格常数、居里温度、饱和磁化强度和最大磁熵变均有所降低。相比于Gd7Pd3,掺入Fe元素的材料可以获得更接近室温的居里温度和更宽的工作温区,从而导致了7 T磁场下高达1096 J·kg^-1的相对制冷能力(RCP), Gd7Pd3-xFex有望被用于室温附近的磁制冷。Gd7Pd3-xFex(x=0, 0.2, 0.5, 0.8, 1) alloys were prepared by arc melting and annealing. The magnetic properties and magnetocaloric effects of Gd7Pd3-xFex alloys were studied. X-ray powder diffraction showed that all alloys are Th7Fe3-type structure. And as x increases, the lattice constant, Curie temperature, saturation magnetization and maximum magnetic entropy change of the alloys decrease. Compared to Gd7Pd3, the alloys doped with Fe have a Curie temperature closer to room temperature and a wider working temperature span, resulting in a relative cooling power(RCP) of 1096 J·kg^-1 under a 7 T magnetic field. Therefore, Gd7Pd3-xFex may be used for magnetic refrigeration near room temperature.

关 键 词：磁性 磁热效应 磁制冷 磁熵变 稀土 

分 类 号：O469[理学—凝聚态物理]