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对Mn1.2Fe0.8P0.48Si0.52和非化学计量比Mn1.2Fe0.8P0.48Si0.49化合物的物相与磁热效应(MCE)进行了研究。结果表明:两种化合物均为Fe2P型六角结构(空间群为P-62m),化合物中含有少量的(Fe,Mn)3Si第二相。当Si的含量x由0.52降到0.49时,化合物的居里温度由268K升到282K,而Si含量的变化对化合物的热滞没有明显的影响。Mn1.2Fe0.8P0.48Si0.52和Mn1.2Fe0.8P0.48Si0.49化合物在外磁场变化为0~1.5T下的最大磁熵变分别为11.7J/kg·K和9.0J/kg·K。低成本的原料、较大的磁熵变使得Mn1.2Fe0.8P0.48Six化合物成为一种理想的室温磁致冷材料。
The phase and magnetocaloric effect (MCE) of Mn1.2Fe0.8P0.48Si0.52 and non-stoichiometric Mn1.2Fe0.8P0.48Si0.49 compounds were investigated. The results show that the two compounds are all Fe2P hexagonal structures (space group P-62m), and the compounds contain a small amount of (Fe, Mn) 3Si second phase. When the content of Si decreases from 0.52 to 0.49, the Curie temperature rises from 268K to 282K, while the Si content has no obvious effect on the thermal hysteresis of the compounds. The maximum magnetic entropy changes of Mn1.2Fe0.8P0.48Si0.52 and Mn1.2Fe0.8P0.48Si0.49 compounds under external magnetic field of 0 ~ 1.5T are 11.7J / kg · K and 9.0J / kg · K, respectively. Low cost raw materials, large magnetic entropy change makes Mn1.2Fe0.8P0.48Six compounds become an ideal room temperature magnetic refrigeration material.