中国物理B ›› 2004, Vol. 13 ›› Issue (3): 393-396.doi: 10.1088/1009-1963/13/3/024

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Magnetism and magnetic entropy change in LaFe11Al2Cx compounds around room temperature

王芳, 陈远富, 王光军, 孙继荣, 沈保根   

  1. State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijng 100080, China
  • 收稿日期:2003-07-28 修回日期:2003-08-11 出版日期:2004-03-06 发布日期:2005-07-06
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (973) (Grant No G1998061303), by the National High Technology Development Program of China (Grant No 2002A A324010), and by the National Natural Science Foundation of China

Magnetism and magnetic entropy change in LaFe11Al2Cx compounds around room temperature

Wang Fang (王芳), Chen Yuan-Fu (陈远富), Wang Guang-Jun (王光军), Sun Ji-Rong (孙继荣), Shen Bao-Gen (沈保根)   

  1. State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijng 100080, China
  • Received:2003-07-28 Revised:2003-08-11 Online:2004-03-06 Published:2005-07-06
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (973) (Grant No G1998061303), by the National High Technology Development Program of China (Grant No 2002A A324010), and by the National Natural Science Foundation of China

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摘要： Magnetism and magnetic entropy changes in LaFe_{11}Al_2C_x (x=0.0, 0.2 and 0.5) compounds have been investigated. The Curie temperature T_C is conveniently controlled from 200K to room temperature by varying the carbon concentration. Large magnetic entropy change is obtained over a wide temperature range due to the high magnetization and the drastic decrease in the magnetization around T_C. The large magnetic entropy change in wide temperature range, low cost and the convenience of controlling T_C suggest that the LaFe_{11}Al_2C_x compounds are promising candidates for magnetic refrigerants in the corresponding temperature range.

关键词: magnetic entropy change, La(Fe_xAl_{1-x})_{13} interstitial compounds

Abstract: Magnetism and magnetic entropy changes in LaFe$_{11}$Al$_2$C$_x$ ($x$=0.0, 0.2 and 0.5) compounds have been investigated. The Curie temperature $T_{\rm C}$ is conveniently controlled from 200K to room temperature by varying the carbon concentration. Large magnetic entropy change is obtained over a wide temperature range due to the high magnetization and the drastic decrease in the magnetization around $T_{\rm C}$. The large magnetic entropy change in wide temperature range, low cost and the convenience of controlling $T_{\rm C}$ suggest that the LaFe$_{11}$Al$_2$C$_x$ compounds are promising candidates for magnetic refrigerants in the corresponding temperature range.

Key words: magnetic entropy change, La(Fe$_x$Al$_{1-x}$)$_{13}$ interstitial compounds

中图分类号:  (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

  • 75.30.Kz
65.40.G- (Other thermodynamical quantities)