用机械合金化方法成功制备了Mn1.35Fe0.65 P1-x Six(x=0.56和0.57)化合物,分别采用了两种不同的工艺对化合物进行热处理.用X射线衍射仪、振动样品磁强计和绝热温变测量仪分别对样品的结构、等温磁熵变和绝热温变进行了测量.实验结果表明,经过两种不同热处理工艺处理的化合物都形成了Fe2P型六角结构,空间群为P62m,在经过淬火处理的Mn1..Fe0 eP0..Si0.56化合物中存在少量的(Mn,Fe) 5Si3第二相,空间群为P63/mcm.样品的居里温度都在室温附近,在278 ～296 K之间变化,不同热处理工艺对化合物的居里温度具有一定的影响.经过淬火处理的化合物存在较小的热滞和较大的等温磁熵变,两种化合物的热滞都由自然冷却处理时的5K降低到淬火处理时的3K.当Si的含量分别为0.56和0.57时,与经过自然冷却处理的化合物相比,经过淬火处理的化合物的最大磁熵变分别提升了33％和20％.在经过淬火处理的Mn1.35Fe0.65P0.44Si0.56化合物磁熵变最大,磁熵变的最大值为4.3J·kg-1·K-1.经过自然冷却处理的Mn1.35 Fe0.65P0.44 Si0.56化合物的最大绝热温变为1.2K.低成本的原料、较小的热滞、理想的制冷温区和较大的磁热效应使得Mn1.35 Fe0.65P1-xSix这一系列化合物在室温磁致冷方面有应用前景.
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