【摘要】 利用机械合金化和固相烧结法制备了Mn_1.25Fe_0.65P_0.50Si_0.50Sn_x（x=0, 0.04, 0.10, 0.20）系列化合物。利用X射线衍射仪、振动样品磁强计、台式电子显微镜、电子万能试验机分析了Sn加入后对化合物结构、磁性、磁热及力学性能的影响。结果表明，所有样品的均表现为P-62m六方相结构。随着Sn含量增加，化合物的一级磁相变特性得到显著增强，磁熵变呈增大趋势。在磁场变化为0～2 T时，在x=0, 0.04, 0.10和0.20时最大磁熵变（-ΔS_M）分别为6.9, 8.0, 11.5和17.1 J/（kg·K）。同时，由于Sn的填充效应，化合物力学性能显著提高，最大抗压强度提高了近50%。更多还原

【Abstract】 The Mn_1.25Fe_0.65P_0.50Si_0.50Sn_x（x=0, 0.04, 0.10, 0.20） compounds were prepared by mechanical alloying and solid-state sintering. The impact of Sn doping on the structural, magnetic, magnetocaloric, and mechanical properties of the compounds were investigated by using X-ray diffractometer, vibrating sample magnetometer, tabletop electron microscope, and universal testing machine. The results show that all samples crystalize in hexagonal phase structure with space group P-62m. A pronounced first-order magnetic transition properties and an enhanced magnetic entropy change is achieved with increasing of Sn content. The maximum magnetic entropy changes（-ΔS_M） are 6.9, 8.0, 11.5, and 17.1 J/（kg·K） for x=0, 0.04, 0.10, and 0.20 under magnetic field change of 0-2 T, respectively. The mechanical properties of the compound were greatly enhanced due to the Sn filling effect, and maximum compressive strength increases nearly 50%.更多还原