Abstract Giant magnetocaloric effect in Mn1.8Fe0.2(P0.59Si0.41)x ( x = 1.00, 1.01, 1.02, 1.03, 1.04) alloys is assessed for cryogenic temperature applications. We found that the Curie temperature can be tuned from. 300 K to 99 K by increase of Mn/Fe and P/Si ratios. We systematically optimized metal/non-metal ratio and homogenization condition to maximize the volume fraction of the Fe2P-type phase. A giant isothermal magnetic entropy changes of 10.6 and 14.0 J/kgK under a magnetic field of 2.0 and 5.0 T is obtained at 117.0 K for Mn1.8Fe0.2(P0.59Si0.41)1.03 alloy. This work demonstrates low-cost Mn-Fe-P-Si alloys with giant MCE are competitive candidates compare to the rare-earth-containing magnetocaloric compounds for cryogenic applications.

中文翻译：

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用于低温磁制冷的磁热 Mn1.8Fe0.2(P0.59Si0.41) 合金的调谐转变温度

摘要 Mn1.8Fe0.2(P0.59Si0.41)x ( x = 1.00, 1.01, 1.02, 1.03, 1.04) 合金的巨磁热效应被评估用于低温应用。我们发现居里温度可以从中调整。通过增加 Mn/Fe 和 P/Si 比率，从 300 K 到 99 K。我们系统地优化了金属/非金属比和均质化条件，以最大限度地提高 Fe2P 型相的体积分数。对于Mn1.8Fe0.2(P0.59Si0.41)1.03合金，在117.0 K的磁场下，在2.0和5.0 T的磁场下获得了10.6和14.0 J/kgK的巨大等温磁熵变。这项工作表明，与用于低温应用的含稀土磁热化合物相比，具有巨大 MCE 的低成本 Mn-Fe-P-Si 合金是具有竞争力的候选者。