中国物理B ›› 2000, Vol. 9 ›› Issue (7): 550-553.doi: 10.1088/1009-1963/9/7/016

• • 上一篇    

GREAT MAGNETIC ENTROPY CHANGE IN La(Fe, M)13 (M=Si, Al) WITH Co DOPING

张西祥1, 沈保根2, 孙继荣2, 胡凤霞3   

  1. (1)Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China; (2)State Key Laboratory of Magnetism, Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; (3)State Key Laboratory of Magnetism, Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; Department of Physics, Capital Normal University, Beijing 100037, China
  • 收稿日期:2000-05-16 出版日期:2000-07-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the State Key Project of Fundamental Research (Grant No. G1998061305) and by the National Natural Science Foundation of China (Grant No. 59525101).

GREAT MAGNETIC ENTROPY CHANGE IN La(Fe, M)13 (M=Si, Al) WITH Co DOPING

Hu Feng-xia (胡凤霞)ab, Shen Bao-gen (沈保根)a, Sun Ji-rong (孙继荣)a, Zhang Xi-xiang (张西祥)c   

  1. a State Key Laboratory of Magnetism, Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b Department of Physics, Capital Normal University, Beijing 100037, China; c Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
  • Received:2000-05-16 Online:2000-07-15 Published:2005-06-12
  • Supported by:
    Project supported by the State Key Project of Fundamental Research (Grant No. G1998061305) and by the National Natural Science Foundation of China (Grant No. 59525101).

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摘要： Very large magnetic entropy change Δ SM, which originates from a fully reversible second-order transition at Curie temperature TC, has been discovered in compounds La(Fe, Si)13, La(Fe, Al)13 and those with Co doping. The maximum change ΔSM\approx19 J·kg-1·K-1, achieved in LaFe11.4Si1.6 at 209K upon a 5T magnetic field change, exceeds that of Gd by more than a factor of 2. The TC of the Co-doped compounds shifts to higher temperatures. ΔSM still has a considerable large magnitude near room temperature. The phenomena of very large ΔSM, convenience of adjustment of TC, and also thesuperiority of low cost, strongly suggest that the compounds La(Fe, M)13 (M=Si, Al) with Co doping are suitable candidates for magnetic refrigerants at high temperatures.

Abstract: Very large magnetic entropy change $\Delta$SM, which originates from a fully reversible second-order transition at Curie temperature TC, has been discovered in compounds La(Fe, Si)13, La(Fe, Al)13 and those with Co doping. The maximum change $\Delta$SM $\approx$ 19 J·kg-1·K-1, achieved in LaFe11.4Si1.6 at 209K upon a 5T magnetic field change, exceedsthat of Gd by more than a factor of 2. The TC of the Co-doped compounds shifts to higher temperatures. $\Delta$SM still has a considerable large magnitude near room temperature. The phenomena of very large $\Delta$SM, convenience of adjustment of TC, and also thesuperiority of low cost, strongly suggest that the compounds La(Fe,M)13(M=Si, Al) with Co doping are suitable candidates for magnetic refrigerants at high temperatures.

Key words: NaZn13-type compounds, magnetic entropy change

中图分类号:  (Impurities in crystals)

  • 61.72.S-
65.40.G- (Other thermodynamical quantities) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)