Magnetocaloric effect on low field in non-stoichiometric MnFe(P,Si,Ge) alloys

Acta Metall Sin

2007, Vol. 43

Issue (8): 889-892 DOI:

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Magnetocaloric effect on low field in non-stoichiometric MnFe(P,Si,Ge) alloys

Gao-Feng WANG;Lin SONG;;;;

内蒙古师范大学

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Gao-Feng WANG; Lin SONG. Magnetocaloric effect on low field in non-stoichiometric MnFe(P,Si,Ge) alloys. Acta Metall Sin, 2007, 43(8): 889-892 .

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Abstract The crystal structure and magnetic properties of non-stoichiometric MnFe（P，Si，Ge） alloys have been investigated by X-ray powder diffraction and magnetic measurements. XRD analysis indicates that all the samples consist of the hexagonal Fe2P-type structure phase mainly and a small amount of the second phase Fe2MnSi. The superfluous of Mn and Fe can reduce the Curie temperature which from 343K to 294K (superfluous Mn) and 286K (superfluous Fe). The superfluous of Fe can decrease the thermal hysteresis, but the superfluous of Mn can increase it. However, the entropy change as well decreased from 5.2 J•kg-1•K-1 (stoichiometric) to 4.9 J•kg-1•K-1 (superfluous Mn) and 3.8 J•kg-1•K-1 (superfluous Fe).

Key words: non-stoichiometric Curie temperature thermal hysteresis magnetic entropy change

Received: 22 November 2006

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