中国物理B ›› 2013, Vol. 22 ›› Issue (3): 37506-037506.doi: 10.1088/1674-1056/22/3/037506

所属专题： TOPICAL REVIEW — Magnetism, magnetic materials, and interdisciplinary research

• SPECIAL TOPIC --- Non-equilibrium phenomena in soft matters • 上一篇    下一篇

Phase transitions and magnetocaloric effects in intermetallic compounds MnFeX (X=P, As, Si, Ge)

特古斯, 包黎红, 松林   

  1. Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China
  • 收稿日期:2013-01-31 出版日期:2013-02-01 发布日期:2013-02-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 50661004 and 51161017).

Phase transitions and magnetocaloric effects in intermetallic compounds MnFeX (X=P, As, Si, Ge)

O. Tegus (特古斯), Bao Li-Hong (包黎红), Song Lin (松林)   

  1. Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China
  • Received:2013-01-31 Online:2013-02-01 Published:2013-02-01
  • Contact: O. Tegus E-mail:tegusph@imnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 50661004 and 51161017).

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摘要： Since the discovery of giant magnetocaloric effect in MnFeP1-xAsx compounds, much valuable work has been performed to develop and improve Fe2P-type transition-metal-based magnetic refrigerants. In this article, the recent progress of our studies on fundamental aspects of theoretical considerations and experimental techniques, effects of atomic substitution on the magnetism and magnetocalorics of Fe2P-type intermetallic compounds MnFeX (X=P, As, Ge, Si) is reviewed. Substituting Si (or Ge) for As leads to an As-free new magnetic material MnFeP1-xSi(Ge)x. These new materials show large magnetocaloric effects resembling MnFe(P, As) near room temperature. Some new physical phenomena, such as huge thermal hysteresis and ‘virgin’ effect, were found in new materials. On the basis of Landau theory, a theoretical model was developed for studying the mechanism of phase transition in these materials. Our studies reveal that MnFe(P, Si) compound is a very promising material for room-temperature magnetic refrigeration and thermo-magnetic power generation.

关键词: Fe2P-type magnetic materials, magnetocaloric refrigeration, thermo-magnetic power generation

Abstract: Since the discovery of giant magnetocaloric effect in MnFeP1-xAsx compounds, much valuable work has been performed to develop and improve Fe2P-type transition-metal-based magnetic refrigerants. In this article, the recent progress of our studies on fundamental aspects of theoretical considerations and experimental techniques, effects of atomic substitution on the magnetism and magnetocalorics of Fe2P-type intermetallic compounds MnFeX (X=P, As, Ge, Si) is reviewed. Substituting Si (or Ge) for As leads to an As-free new magnetic material MnFeP1-xSi(Ge)x. These new materials show large magnetocaloric effects resembling MnFe(P, As) near room temperature. Some new physical phenomena, such as huge thermal hysteresis and ‘virgin’ effect, were found in new materials. On the basis of Landau theory, a theoretical model was developed for studying the mechanism of phase transition in these materials. Our studies reveal that MnFe(P, Si) compound is a very promising material for room-temperature magnetic refrigeration and thermo-magnetic power generation.

Key words: Fe2P-type magnetic materials, magnetocaloric refrigeration, thermo-magnetic power generation

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

  • 75.30.Sg
75.50.Gg (Ferrimagnetics)