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Achievement of giant cryogenic refrigerant capacity in quinary rare-earths based high-entropy amorphous alloy
Journal of Materials Science & Technology ( IF 11.2 ) Pub Date : 2021-08-26 , DOI: 10.1016/j.jmst.2021.06.028
Yikun Zhang 1 , Jian Zhu 1 , Shuo Li 1 , Jiang Wang 1 , Zhongming Ren 1
Affiliation  

Magnetic refrigeration (MR) by utilizing the magnetocaloric (MC) effect is recognized as one of the most potential promising solid state environmentally friendly and high efficiency alternative method to the well-used state-of-the-art gas compression cooling technique. In this work, a systematic investigation of quinary equi-atomic rare-earths (RE) based Er20Ho20Gd20Ni20Co20 high-entropy (HE) amorphous alloy in terms of the microstructure, magnetic and magnetocaloric (MC) properties have been reported. The Er20Ho20Gd20Ni20Co20 exhibits promising glass forming ability with an undercooled liquid region of 72 K. Excellent cryogenic MC performances can be found in wide temperature from ∼25 and ∼75 K, close to H2 and N2 liquefaction, respectively. Apart from the largest magnetic entropy change (-ΔSM) reaches 17.84 J/(kg K) with 0-7 T magnetic field change, corresponding refrigerant capacity (RC) attains a giant value of 1030 J/kg. The promising cryogenic MC performances together with the unique HE amorphous characterizations make the quinary Er20Ho20Gd20Ni20Co20 HE amorphous alloy attractive for cryogenic MR applications.



中文翻译:

五元稀土基高熵非晶合金超低温制冷剂容量的实现

利用磁热 (MC) 效应的磁制冷 (MR) 被认为是最有潜力的固态环境友好型高效替代方法之一,可替代广泛使用的最先进的气体压缩冷却技术。在这项工作中,系统研究了基于五元等原子稀土 (RE) 的 Er 20 Ho 20 Gd 20 Ni 20 Co 20高熵 (HE) 非晶合金的微观结构、磁性和磁热 (MC) 性能已经汇报过。Er 20 Ho 20 Gd 20 Ni 20 Co 20在 72 K 的过冷液体区域表现出良好的玻璃形成能力。在从 ~25 和 ~75 K 的宽温度范围内可以发现出色的低温 MC 性能,分别接近 H 2和 N 2液化。除了最大的磁熵变 (-Δ S M ) 在 0-7 T 磁场变化时达到 17.84 J/(kg K) 外,相应的制冷剂容量 (RC) 达到了 1030 J/kg 的巨值。有前途的低温 MC 性能以及独特的 HE 非晶表征使五元 Er 20 Ho 20 Gd 20 Ni 20 Co 20 HE 非晶合金对低温 MR 应用具有吸引力。

更新日期:2021-09-13
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