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
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
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.
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