非化学计量比MnFe(P, Si, Ge)合金在低场下的磁热效应

金属学报, 2007, 43(8): 889-892.

非化学计量比MnFe(P, Si, Ge)合金在低场下的磁热效应

内蒙古师范大学

关键词： MnFe(P , Curie temperature , thermal hysteresis , magnetic entropy change , null

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

Gao-Feng WANG , Lin SONG , null , null , null , null

Keywords： non-stoichiometric , Si , Ge)合金 , 非化学计量比 , Curie

通过XRD和磁性测量对非化学计量比MnFe(P, Si, Ge)合金的相组成和磁性进行了研究.XRD分析表明, 所有样品都具有Fe2P型六角结构, 主相为(Fe, Mn)2(P, Si, Ge), 并存在少量的第二相(Fe, Mn)3(Si, Ge). 过量的Mn和Fe都会使合金的Curie温度降低, 由343 K(化学计量比)降低到294 K(过量Mn)和286 K(过量Fe); 过量的Mn能减小热滞, 而过量的Fe会使热滞增加; 磁熵变也有所减小,在1.5 T的磁场下, 最大磁熵变由5.2 J/(kgK)(化学计量比)减小到4.9 J/(kgK)(过量Mn)和3.8 J/(kgK)(过量Fe).

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).

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