中国物理B ›› 2002, Vol. 11 ›› Issue (7): 741-744.doi: 10.1088/1009-1963/11/7/318

• • 上一篇    

Large magnetic entropy change near room temperature in the LaFe11.5Si1.5H1.3 interstitial compound

陈远富, 王芳, 沈保根, 胡凤霞, 成昭华, 王光军, 孙继荣   

  1. State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2002-05-04 出版日期:2002-07-12 发布日期:2005-06-12
  • 基金资助:
    Project supported by the State Key Programme of Basic Research of China (973) (Grant No G1998061303) and by the National Natural Science Foundation of China (Grant No 10174094).

Large magnetic entropy change near room temperature in the LaFe11.5Si1.5H1.3 interstitial compound

Chen Yuan-Fu (陈远富), Wang Fang (王芳), Shen Bao-Gen (沈保根), Hu Feng-Xia (胡凤霞), Cheng Zhao-Hua (成昭华), Wang Guang-Jun (王光军), Sun Ji-Rong (孙继荣)   

  1. State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2002-05-04 Online:2002-07-12 Published:2005-06-12
  • Supported by:
    Project supported by the State Key Programme of Basic Research of China (973) (Grant No G1998061303) and by the National Natural Science Foundation of China (Grant No 10174094).

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摘要： The LaFe11.5Si1.5H1.3 interstitial compound has been prepared. Its Curie temperature TC (288 K) has been adjusted to around room temperature, and the maximal magnetic entropy change (|ΔS|～17.0 J·kg-1·K-1 at TC) is larger than that of Gd (|ΔS|～9.8 J·kg-1·K-1 at TC=293 K) by ～73.5% under a magnetic change from 0 to 5 T. The origin of the large magnetic entropy change is attributed to the first-order field-induced itinerant-electron metamagnetic transition. Moreover, the magnetic hysteresis of LaFe11.5Si1.5H1.3 under the increase and decrease of the field is very small, which is favourable to magnetic refrigeration application. The present study suggests that the LaFe11.5Si1.5H1.3 compound is a promising candidate as a room-temperature magnetic refrigerant.

Abstract: The LaFe11.5Si1.5H1.3 interstitial compound has been prepared. Its Curie temperature TC (288 K) has been adjusted to around room temperature, and the maximal magnetic entropy change (|ΔS|～17.0 J·kg-1·K-1 at TC) is larger than that of Gd (|ΔS|～9.8 J·kg-1·K-1 at TC=293 K) by ～73.5% under a magnetic change from 0 to 5 T. The origin of the large magnetic entropy change is attributed to the first-order field-induced itinerant-electron metamagnetic transition. Moreover, the magnetic hysteresis of LaFe11.5Si1.5H1.3 under the increase and decrease of the field is very small, which is favourable to magnetic refrigeration application. The present study suggests that the LaFe11.5Si1.5H1.3 compound is a promising candidate as a room-temperature magnetic refrigerant.

Key words: NaZn13-type hydride, magnetic entropy change, room temperature magnetic refrigerant

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

  • 75.30.Kz
75.30.Sg (Magnetocaloric effect, magnetic cooling) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 07.20.Mc (Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)