Enhanced magnetocaloric effects of Ni-Fe-Mn-Sn alloys involving strong metamagnetic behavior
Enhanced magnetocaloric effects of Ni-Fe-Mn-Sn alloys involving strong metamagnetic behavior
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DOI：
10.1016/j.jallcom.2017.04.277
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发表时间：
2017-08
影响因子：
6.2
通讯作者：
Hehe Zhang;Xuexi Zhang;M. Qian;Longsha Wei;D. Xing;Jianfei Sun;L. Geng
中科院分区：
文献类型：
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作者：
Hehe Zhang;Xuexi Zhang;M. Qian;Longsha Wei;D. Xing;Jianfei Sun;L. Geng
最近，我们报道了Fe掺杂的Ni 50-xFexMn38.0Sn12.0合金在马氏体和奥氏体相之间表现出增强的磁化差Δ M。值得注意的是，具有x = 4.2的合金表现出强的变磁转变行为，即磁场诱导的逆马氏体转变，这有利于磁热效应。本文报道了所选Ni35.8Fe4.2Mn38.0Sn12.0合金中与变磁转变有关的增强磁热效应。由于磁与结构的耦合作用，该合金在马氏体和奥氏体两相间具有很高的磁化强度差Δ M（Δ M = 58 A·m2/kg）。Fe的掺杂导致强变磁行为，奥氏体峰温位移ΔAp/Δ H达到−2.4 K/T。结果表明，磁熵变Δ Sm从起始临界磁场~ 0.2T开始迅速增加，然后在不同的终止临界磁场下饱和，这取决于工作温度。在5 T磁场下，当工作温度间隔为7 K时，获得了33.8J/kg·K的峰值Δ Sm，并由此获得了237 J/kg的相对冷却功率RCP。这些结果表明，Ni45.8Fe4.2Mn38.0Sn12.0合金是一种潜在的固态磁制冷剂。
Very recently, we reported that Fe-doped Ni50-xFexMn38.0Sn12.0alloys exhibited enhanced magnetization difference ΔMbetween the martensite and austenite phases. Of note is that the alloy with x = 4.2 exhibits a strong metamagnetic transition behavior, i.e. magnetic-field-induced reverse martensite transformation, which is favorable for the magnetocaloric effects. Here, the enhanced magnetocaloric effect related to metamagnetic transition in the selected Ni35.8Fe4.2Mn38.0Sn12.0alloy was reported. This alloy exhibits a high magnetization difference ΔMof ∼58 A·m2/kg between martensite and austenite phases owing to the magnetic and structural coupling. The doping of Fe leads to a strong metamagnetic behavior, with austenite peak temperature shift ΔAp/ΔHreaching −2.4 K/T. As a result, the magnetic entropy change ΔSmincreases rapidly from a starting critical magnetic field ∼0.2 T and then saturates at various finishing critical magnetic fields, depending on the working temperature. A sizable peak ΔSmof 33.8 J/kg·K with a working temperature interval of 7 K is obtained under a magnetic field of 5 T, which is responsible for a high relative cooling powerRCPof 237 J/kg. These results suggest that Ni45.8Fe4.2Mn38.0Sn12.0alloy may act as a potential solid-state magnetic refrigerant.