【摘要】 通过机械合金化结合等放电离子烧结技术,采用不同烧结温度制备名义成分相同的Mn_1.2Fe_0.8P_0.73Ge_0.27样品。使用X射线衍射仪（XRD）、差示扫描热量分析仪（DSC）、扫描电镜（SEM）研究了不同烧结温度对材料的成分、晶粒大小和磁热性能的影响。结果表明,材料均保持六方Fe₂P结构。随烧结温度的升高,居里温度下降,晶粒长大,熵变上升;而杂相Ge₆Fe₃Mn₄向Mn_1.2Fe_0.8P_0.73Ge_0.27主相转化,而氧化物的含量基本不发生变化。更多还原

【Abstract】 Mn_1.2Fe_0.8P_0.73Ge_0.27 alloys with the same initial component were prepared at different sinter temperatures by mechanical alloying and spark plasma sintering technique. The magnetocaloric properties and microstructures were investigated by X-ray diffraction（ XRD）,differential scanning calorimetry（ DSC）,scanning electron microscope（ SEM）. The results show that samples crystalize in the hexagonal Fe₂P-type structure. When the sintering temperatures rises,the Tc decreases,grain grows and the entropy change increases. The Ge₆Fe₃Mn₄ transformed to Mn_1.2Fe_0.8P_0.73Ge_0.27 with the rise of sintering temperature,while no change with MnO content were found.更多还原