The Role of Compositional Tuning of the Distributed Exchange on Magnetocaloric Properties of High-Entropy Alloys
The Role of Compositional Tuning of the Distributed Exchange on Magnetocaloric Properties of High-Entropy Alloys
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DOI：
10.1007/s11837-017-2523-3
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发表时间：
2017-11
期刊：
影响因子：
2.6
通讯作者：
Alice Perrin;M. Sorescu;M. Burton;D. Laughlin;M. McHenry
中科院分区：
文献类型：
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作者：
Alice Perrin;M. Sorescu;M. Burton;D. Laughlin;M. McHenry
本文探讨了FeCoNiCuMn高熵合金系统，其中与等原子组成的微小偏离已经产生了技术上有趣的300-K居里温度（），使它们有希望用于磁热应用。我们还证明了等原子组成的小偏差不会影响单相fcc固溶体的结构稳定性。室温Mössbauer光谱测量为磁性元素之间发生的分布式交换相互作用（）提供了证据，这有助于扩大这些合金所观察到的磁热效应。在Mössbauer光谱中观察到的平均超细场随着合金的减少而减少，证实了直流磁测量。考虑到除Cu稀释剂外所有元素之间的铁磁性或反铁磁性，超细场分布中的多个峰被解释为有助于合金中整体磁交换。
This paper explores the FeCoNiCuMn high-entropy alloy system, where small departures from equiatomic composition have yielded technologically interesting 300-K Curie temperatures (), making them promising for magnetocaloric applications. We also demonstrate that the small deviations from equiatomic compositions do not affect the structural stability of our single-phase fcc-based solid solutions. Room-temperature Mössbauer spectroscopy measurements provide evidence for the distributed exchange interactions () occurring between the magnetic elements, which contribute to a broadened magnetocaloric effect observed for these alloys. The average hyperfine field observed in the Mössbauer spectra decreases as theof the alloys decrease, confirming direct current magnetic measurements. Multiple peaks in the hyperfine field distribution are interpreted considering pairwise ferromagnetic or antiferromagneticbetween all elements except the Cu diluent as contributing to overall magnetic exchange in the alloy.