中国物理B ›› 2004, Vol. 13 ›› Issue (7): 1134-1138.doi: 10.1088/1009-1963/13/7/030

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Effect of Co substitution on magnetic properties and magnetic entropy changes in LaFe11.83Si0.94Al0.23 compounds

李养贤1, 沈俊2, 王芳3, 王光军3, 张绍英3   

  1. (1)School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (2)School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; State Key Laboratory of Magnetism, Institute of Physics and Centre of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; (3)State Key Laboratory of Magnetism, Institute of Physics and Centre of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2004-01-09 修回日期:2004-03-21 出版日期:2004-07-05 发布日期:2005-07-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10174094).

Effect of Co substitution on magnetic properties and magnetic entropy changes in LaFe11.83Si0.94Al0.23 compounds

Shen Jun (沈俊)ab, Li Yang-Xian (李养贤)a, Wang Fang (王芳)b, Wang Guang-Jun (王光军)b, Zhang Shao-Ying (张绍英)b   

  1. a School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China; b State Key Laboratory of Magnetism, Institute of Physics and Centre of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2004-01-09 Revised:2004-03-21 Online:2004-07-05 Published:2005-07-05
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10174094).

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摘要： Effect of Co substitution on magnetic properties and magnetic entropy changes in LaFe_{11.83}Si_{0.94}Al_{0.23} compounds has been investigated by means of magnetization measurements. X-ray diffraction shows the prepared compounds to be single phase with the cubic NaZn_{13}-type structure. Substitution of Co for Fe leads to an increase of Curie temperature of the material. The magnetic entropy changes in LaFe_{11.83}Si_{0.94}Al_{0.23} and LaFe_{11.03}Co_{0.80}Si_{0.94}Al_{0.23} compounds are 21.8J/(kg·K) to 16.9J/(kg·K) under a magnetic field change of 0－5T at Curie temperature, respectively. Giant magnetic entropy changes are attributed to the higher magnetization and the rapid change in magnetization at Curie temperature.

关键词: LaFe_{11.03}Co_{0.80}Si_{0.94}Al_{0.23} compounds, magnetic property, magnetic entropy change

Abstract: Effect of Co substitution on magnetic properties and magnetic entropy changes in LaFe$_{11.83}$Si$_{0.94}$Al$_{0.23}$ compounds has been investigated by means of magnetization measurements. X-ray diffraction shows the prepared compounds to be single phase with the cubic NaZn$_{13}$-type structure. Substitution of Co for Fe leads to an increase of Curie temperature of the material. The magnetic entropy changes in LaFe$_{11.83}$Si$_{0.94}$Al$_{0.23}$ and LaFe$_{11.03}$Co$_{0.80}$Si$_{0.94}$Al$_{0.23}$ compounds are 21.8J/(kg$\cdot$K) to 16.9J/(kg$\cdot$K) under a magnetic field change of 0－5T at Curie temperature, respectively. Giant magnetic entropy changes are attributed to the higher magnetization and the rapid change in magnetization at Curie temperature.

Key words: LaFe$_{11.03}$Co$_{0.80}$Si$_{0.94}$Al$_{0.23}$ compounds, magnetic property, magnetic entropy change

中图分类号:  (Magnetic impurity interactions)

  • 75.30.Hx
75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 61.66.Dk (Alloys ) 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.))