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利用MA+SPS技术制备Mn1.1Fe0.9P0.8Ge0.2Bx(x=0,0.02,0.03,0.04)化合物并对其晶体结构和磁热性能进行研究。XRD分析结果表明:该系列化合物具有六方Fe2P结构。随着B含量的增加晶格常数a和c均发生了明显的变化,导致c/a的值先减小后增大。分别利用DSC和VSM对材料的磁热性能进行了测试,结果表明居里温度TC和熵变均与B的含量存在一个非线性关系,当B的含量为0.02时Mn1.1Fe0.9P0.8Ge0.2B0.02化合物的磁热性能最好,TC从x=0时的253K增加到263K,相应的滞后从23K下降到19K,在0~2T外磁场下的磁熵变从28.7J/kg·K增加到32.6J/kg·K。
The compound Mn1.1Fe0.9P0.8Ge0.2Bx (x = 0,0.02,0.03,0.04) was prepared by MA + SPS technique and its crystal structure and magnetocaloric properties were studied. The results of XRD analysis show that the compounds have hexagonal Fe2P structure. With the increase of B content, the lattice constants a and c all change obviously, which leads to the value of c / a decreasing and then increasing. The magnetocaloric properties of the materials were tested by DSC and VSM respectively. The results show that there is a nonlinear relationship between the Curie temperature TC and entropy change and the content of B, when the content of B is 0.02 Mn1.1Fe0.9P0.8Ge0. The magnetocaloric property of 2B0.02 compound is the best. The TC increases from 253K to 263K at x = 0, and the corresponding hysteresis decreases from 23K to 19K. The magnetic entropy change from 0 to 2T magnetic field is 28.7J / kg · K Increased to 32.6J / kg · K.