研究了Mn1.25Fe0.75P1-xSix(x=0.50,0.52,0.54,0.56,0.58,0.60)合金的物相、热滞及磁热效应.通过XRD分析表明,合金主相均为Fe2P六角结构(空间群为P(6)2m).在不同Si含量时,合金中存在FeSi型或Fe3Si型第二相.通过调节Si和P含量的比率,合金的居里温度随Si含量的增加成线性增加,从240 K到313K.而合金的热滞在逐渐减小.当Si含量为0.58时,在外磁场变化为0~1.5 T下合金的最大等温磁熵变为8.6 J/kg·K.
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