Defect Engineering: Electron-Exchange Integral Manipulation to Generate a Large Magnetocaloric Effect in Ni41Mn43Co6Sn10 Alloys
Defect Engineering: Electron-Exchange Integral Manipulation to Generate a Large Magnetocaloric Effect in Ni41Mn43Co6Sn10 Alloys
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缺陷工程：电子交换积分操作在 Ni41Mn43Co6Sn10 合金中产生大磁热效应
DOI：
10.1021/acsami.1c18587
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发表时间：
2021
影响因子：
9.5
通讯作者：
Cai Wei
中科院分区：
文献类型：
--
作者：
Sun Sibo;Qin Haixu;Kong Lingjiao;Ning Rui;Zhao Yundong;Gao Zhiyong;Cai Wei
在Ni-(Co)-Mn-X(X=Sn，In，Sb)基Heusler合金中获得了良好的磁热效应，但低等温磁熵变ΔSm限制了此类材料的进一步推广。缺陷工程是一种有效的磁性能调节方法，在改善磁热效应方面显示出巨大的潜力。本工作采用高能电子辐照的方法在Ni41Mn43Co6Sn10合金中引入致密的Ni空位来调节其磁性能。这些空位引起了强烈的晶格扭曲，从而改变了相邻磁性原子之间的距离，导致平均磁矩显著增加。结果表明，在很低的磁场(Δ2 T)下，铁磁奥氏体的饱和磁化强度相应地得到了较高的等温磁熵变∼SMOF 2 0.0 J/(KgK)。
A promising magnetocaloric effect has been obtained in Ni–(Co)–Mn–X (X = Sn, In, Sb)-based Heusler alloys, but the low isothermal magnetic entropy change ΔSMrestricts the further promotion of such materials. Defect engineering is a useful method to modulate magnetic performance and shows great potential in improving the magnetocaloric effect. In this work, dense Ni vacancies are introduced in Ni41Mn43Co6Sn10alloys by employing high-energy electron irradiation to adjust the magnetic properties. These vacancies bring about intense lattice distortion to change the distance between adjacent magnetic atoms, leading to a significant enhancement of the average magnetic moment. As a result, the saturation magnetization of ferromagnetic austenite is accordingly improved to generate a high isothermal magnetic entropy change ΔSMof 20.0 J/(kg K) at a very low magnetic field of ∼2 T.