中国物理B ›› 2015, Vol. 24 ›› Issue (1): 17505-017505.doi: 10.1088/1674-1056/24/1/017505

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

MnFe(PGe) compounds: Preparation, structural evolution, and magnetocaloric effects

岳明a, 张红国a, 刘丹敏b, 张久兴a   

  1. a College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
    b Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China
  • 收稿日期:2014-11-06 修回日期:2014-12-09 出版日期:2015-01-05 发布日期:2015-01-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 51171003, 51071007, and 51401002).

MnFe(PGe) compounds: Preparation, structural evolution, and magnetocaloric effects

Yue Ming (岳明)a, Zhang Hong-Guo (张红国)a, Liu Dan-Min (刘丹敏)b, Zhang Jiu-Xing (张久兴)a   

  1. a College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
    b Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China
  • Received:2014-11-06 Revised:2014-12-09 Online:2015-01-05 Published:2015-01-05
  • Contact: Yue Ming E-mail:yueming@bjut.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 51171003, 51071007, and 51401002).

摘要:

The interdependences of preparation conditions, magnetic and crystal structures, and magnetocaloric effects (MCE) of the MnFePGe-based compounds are reviewed. Based upon those findings, a new method for the evaluation of the MCE in these compounds, based on differential scanning calorimetry (DSC), is proposed. The MnFePGe-based compounds are a group of magnetic refrigerants with giant magnetocaloric effect (GMCE), and as such, have drawn tremendous attention, especially due to their many advantages for practical applications. Structural evolution and phase transformation in the compounds as functions of temperature, pressure, and magnetic field are reported. Influences of preparation conditions upon the homogeneity of the compounds' chemical composition and microstructure, both of which play a key role in the MCE and thermal hysteresis of the compounds, are introduced. Lastly, the origin of the “virgin effect” in the MnFePGebased compounds is discussed.

关键词: MnFePGe-based compounds, magnetocaloric effect, structural evolution, thermal hysteresis, virgin effect

Abstract:

The interdependences of preparation conditions, magnetic and crystal structures, and magnetocaloric effects (MCE) of the MnFePGe-based compounds are reviewed. Based upon those findings, a new method for the evaluation of the MCE in these compounds, based on differential scanning calorimetry (DSC), is proposed. The MnFePGe-based compounds are a group of magnetic refrigerants with giant magnetocaloric effect (GMCE), and as such, have drawn tremendous attention, especially due to their many advantages for practical applications. Structural evolution and phase transformation in the compounds as functions of temperature, pressure, and magnetic field are reported. Influences of preparation conditions upon the homogeneity of the compounds' chemical composition and microstructure, both of which play a key role in the MCE and thermal hysteresis of the compounds, are introduced. Lastly, the origin of the “virgin effect” in the MnFePGebased compounds is discussed.

Key words: MnFePGe-based compounds, magnetocaloric effect, structural evolution, thermal hysteresis, virgin effect

中图分类号:  (Metals and alloys)

  • 75.20.En
75.30.Sg (Magnetocaloric effect, magnetic cooling) 75.50.Gg (Ferrimagnetics)