中文摘要：

对Mn1.35Fe0.65P0.45Si0.55Bx（x=0，0．01，0．02，0．03，0．04）合金的结构和磁热效应（MCE）进行了研究。XRD分析结果表明：Mn1.35Fe0.65P0.45Si0.55Bx髓（x=0，0．01，0．02，0．03，0．04）的合金均为Fe2P型六角结构，空间群为P62m，并随着B元素（原子分数）的增加，晶格常数。增大，c／a减小，晶胞体积V略有减小。磁性测量表明：随着B元素（原子分数）的增加，Curie温度（Tc）从228K升高到315K，热滞（△Thys）变化不大。0h1．5T外磁场下最大磁熵变（-△sMmax）下降，分别为3．6，2．5，2．0，1．7，1．9J／（kg·K）。

英文摘要：

Structure and magnetocaloric effect（MCE）of the Mn1.35Fe0.65P0.45Si0.55Bx（x= 0, 0.01, 0.02, 0.03 and 0.04, atomic fraction）alloys have been investigated. XRD result shows that the Mn1.35Fe0.65P0.45Si0.55Bx（x= 0, 0.01, 0.02, 0.03 and 0.04） alloys mainly consist of the Fe2 P-type hexagonal structure phase with space group P62 m. With increasing x lattice parameter a increases while lattice parameter c decreases, unit cell volume V de- creases slightly. The magnetic measurements show that the Curie temperature increases from 228 to 315 K, while the thermal hysteresis has little change. The maximum magnetic entropy change, in a magnetic field change of 0-- 1.5 T, decrease slightly with increasing boron content and their values are 3.6, 2.5, 2.0, 1.7 and 1.9 J/（kg· K）, respectively