中国物理B ›› 2010, Vol. 19 ›› Issue (6): 67501-067501.doi: 10.1088/1674-1056/19/6/067501

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Magnetic properties and magnetocaloric effect in compound PrFe12B6

张健1, 李养贤1, 王芳2, 沈保根3, 孙继荣3, 孟凡斌3   

  1. (1)School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (2)School of Science, Tianjin University of Science and Technology, Tianjin 300222, China; (3)State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2009-10-12 出版日期:2010-06-15 发布日期:2010-06-15
  • 基金资助:
    Project supported by the Scientific Research Foundation for Bringing Talents of Tianjin University of Science and Technology, China (Grant No.~20090426), the National Natural Science Foundation of China (Grant Nos.~50571112 and 50731007), the National Bas

Magnetic properties and magnetocaloric effect in compound PrFe12B6

Wang Fang(王芳)a)†, Shen Bao-Gen(沈保根) b), Zhang Jian(张健)c), Sun Ji-Rong(孙继荣)b), Meng Fan-Bin(孟凡斌)c), and Li Yang-Xian(李养贤)c)   

  1. a School of Science, Tianjin University of Science and Technology, Tianjin 300222, China; b State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China; c School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China
  • Received:2009-10-12 Online:2010-06-15 Published:2010-06-15
  • Supported by:
    Project supported by the Scientific Research Foundation for Bringing Talents of Tianjin University of Science and Technology, China (Grant No.~20090426), the National Natural Science Foundation of China (Grant Nos.~50571112 and 50731007), the National Bas

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摘要： Magnetic properties and magnetocaloric effect of compound PrFe12B6 are investigated. The coexistence of hard phase PrFe12B6 and soft phase α--Fe causes interesting phenomena on the curves for the temperature dependence of magnetization. PrFe12B6 experiences a first order phase transition at the Curie temperature 200~K, accompanied by an obvious lattice contraction, which in turn results in a large magnetic entropy change. The Maxwell relation fails to give the correct information about magnetic entropy change due to the first order phase transition nature. The large magnetic entropy changes of PrFe_{12.3}B_{4.7} obtained from heat capacity method are 11.7 and 16.2~J/kg.K for magnetic field changes of 0--2~T and 0--5~T respectively.

Abstract: Magnetic properties and magnetocaloric effect of compound PrFe12B6 are investigated. The coexistence of hard phase PrFe12B6 and soft phase $\alpha$--Fe causes interesting phenomena on the curves for the temperature dependence of magnetization. PrFe12B6 experiences a first order phase transition at the Curie temperature 200 K, accompanied by an obvious lattice contraction, which in turn results in a large magnetic entropy change. The Maxwell relation fails to give the correct information about magnetic entropy change due to the first order phase transition nature. The large magnetic entropy changes of PrFe12.3B4.7 obtained from heat capacity method are 11.7 and 16.2 J/kg.K for magnetic field changes of 0--2 T and 0--5 T respectively.

Key words: magnetic properties, magnetic entropy change, first order phase transition

中图分类号:  (Magnetocaloric effect, magnetic cooling)

  • 75.30.Sg
75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)) 65.40.Ba (Heat capacity) 65.40.G- (Other thermodynamical quantities)