RESEARCH OF THE RELATIONSHIP BETWEEN PHASE TRANSITION PROCESS AND MAGNETIC PROPERTIES IN MAGNETIC REFRIGERATION MATERIAL Mn1.2Fe0.8P0.76Ge0.24

ZHANG Meng; LIU Danmin; LIU Cuixiu; HUANG Qingzhen; WANG Shaobo; ZHANG Hu; YUE Ming

doi:10.3724/SP.J.1037.2012.00775

2013 , Vol. 49 >Issue 7: 783 - 788

DOI: https://doi.org/10.3724/SP.J.1037.2012.00775

RESEARCH OF THE RELATIONSHIP BETWEEN PHASE TRANSITION PROCESS AND MAGNETIC PROPERTIES IN MAGNETIC REFRIGERATION MATERIAL Mn_1.2Fe_0.8P_0.76Ge_0.24

ZHANG Meng ,
LIU Danmin ,
LIU Cuixiu ,
HUANG Qingzhen ,
WANG Shaobo ,
ZHANG Hu ,
YUE Ming

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1) Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124
2) NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
3) College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

Received date: 2012-12-25

Revised date: 2013-04-12

Online published: 2013-07-11

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Abstract

In recent years, the MnFePGe compound has drawn tremendous attention not only for its excellent magnetocaloric effect (MCE), but also for its great commercial interest.Compared with other advanced MCE materials such as GdSiGe, MnFePAs, etc.,it possesses many practical advantages such as more abundant raw materials,lower fabrication costs as well as better environmental amity. In this work, Mn_1.2Fe_0.8P_0.76Ge_0.24 compound was prepared by mechanical milling and subsequent spark plasma sintering (SPS) technique, its microstructure was investigated by SEM, meanwhile the relationship between phase transition and the properties was investigated by neutrondiffraction, SQUID, DSC and XRD. The results show that the Mn_1.2Fe_0.8P_0.76Ge_0.24 compound is compact, and possess a hexagonal Fe₂P-type crystal structure. Generally, either applied magnetic field or temperature change will induce the transformation between paramagnetic phase and ferromagnetic phase. When the applied magnetic field increased or temperature reduced, paramagnetic phase transformed to ferromagnetic phase and caused the magnetic entropy change to become larger. It is found that the magnetic entropy change of Mn_1.2Fe_0.8P_0.76Ge_0.24 compound is directly corresponding to the percentage of the phase transition.

Key words： magnetic refrigeration material; magnetic thermal phase transition process; neutron diffraction

Cite this article

ZHANG Meng , LIU Danmin , LIU Cuixiu , HUANG Qingzhen , WANG Shaobo , ZHANG Hu , YUE Ming . RESEARCH OF THE RELATIONSHIP BETWEEN PHASE TRANSITION PROCESS AND MAGNETIC PROPERTIES IN MAGNETIC REFRIGERATION MATERIAL Mn_1.2Fe_0.8P_0.76Ge_0.24[J]. Acta Metall Sin, 2013 , 49(7) : 783 -788 . DOI: 10.3724/SP.J.1037.2012.00775

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