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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(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P6-2 m,并随着B元素(原子分数)的增加,晶格常数a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(ΔThys)变化不大。0~1.5T外磁场下最大磁熵变(-ΔSmax M)下降,分别为3.6,2.5,2.0,1.7,1.9J/(kg·K)。
The structure and magnetocaloric effect (MCE) of Mn1.35Fe0.65P0.45Si0.55Bx (x = 0,0.01,0.02,0.03,0.04) alloys were studied. The results of XRD analysis show that all the alloys of Mn1.35Fe0.65P0.45Si0.55Bx (x = 0,0.01,0.02,0.03,0.04) have hexagonal Fe2P structure and space group P6-2 m, and with the increase of element B ( Atomic fraction) increases, the lattice constant a increases, c / a decreases, the unit cell volume V decreases slightly. Magnetic measurements show that as the B element (atomic fraction) increases, the Curie temperature (Tc) increases from 228K to 315K and the thermal hysteresis (ΔThys) does not change much. The maximum magnetic entropy change (-ΔSmax M) decreased from 0 to 1.5 T under the magnetic field of 3.6, 2.5, 2.0, 1.7 and 1.9 J / (kg · K), respectively.