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用粉末冶金法(磁场压制烧结)制备(Mn1-xFex)5Sn3(x=0.1～0.5)合金,对其晶体结构、居里温度进行研究。室温XRD分析表明,该系列合金均保持Mn5Sn3的InNi2型相结构,计算发现合金的晶格常数随着x量增大而减小。通过M-T曲线测量结果表明:居里温度TC在室温附近244～391K连续可调,且随着Fe含量的增加而提高,居里温度随成分近似呈线性变化;成分为(Mn0.70Fe0.30)5Sn3合金的居里温度为295K,在外加磁场为0～1.5T下,最大磁熵变约为0.87J·(kg·K)-1,是一种成本低廉的室温磁制冷候选材料。
The (Mn1-xFex) 5Sn3 (x = 0.1 ~ 0.5) alloy was prepared by powder metallurgy (magnetic field sintering) and its crystal structure and Curie temperature were studied. The results of XRD at room temperature show that the InNi2 phase structure of Mn5Sn3 is retained in this series of alloys, and the lattice constant of the alloy decreases with the increase of x amount. The results of MT curve show that the Curie temperature TC is continuously adjustable from 244 to 391 K near room temperature and increases with the increase of Fe content. The Curie temperature changes linearly with the composition. The composition is (Mn0.70Fe0.30) The Curie temperature of 5Sn3 alloy is 295K, and the maximum magnetic entropy change is about 0.87J · (kg · K) -1 under the applied magnetic field of 0 ~ 1.5T, which is a low cost room temperature magnetic refrigeration candidate material.