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(Re,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343K(化学计量比)降低到294K(过量Mn)和286K(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1.5T的磁场下,最大磁熵变由5.2J/(kg·K)(化学计量比)减小到4.9J/(kg·K)(过量Mn)和3.8J/(kg·K)(过量Fe).
The phases and magnetic properties of non-stoichiometric MnFe(P, Si, Ge) alloys have been measured by XRD and magnetic measurements. XRD analysis indicated that all the samples consist of the matrix (Fe, Mn)2(P, Si, Ge) phase and a small amount of the second phase (Fe, Mn)3(Si, Ge). The superfluous Mn and Fe can reduce the Curie temperature from 343 K to 294 and 286 K, respectively. The superfluous Mn can decrease the thermal hysteresis, but the superfluous Fe can increase it. However, the entropy change decreased from 5.2 J/(kg·K) (stoichiometric) to 4.9 J/(kg·K) (superfluous Mn) and 3.8 J/(kg·K) (superfluous Fe).