Abstract In this paper, the magnetocaloric effect (MCE) of a high-entropy Gd19Tb19Er18Fe19Al25 amorphous microwires fabricated by melt-extracted method are investigated systematically. These microwires exhibit a second-order phase transition from ferromagnetic to paramagnetic states at the Curie temperature of 97 K. The zero-field-cooling (ZFC) and field-cooling (FC) magnetization curves are irreversible when the temperature lower than the Curie temperature due to the spin glassy freezing behavior. The peak magnetic entropy change ( Δ S M pk ) for a field change from 0 to 5 T reaches ~5.94 J/kg∙K. In accordance to two criteria refrigerant capacity, the values of refrigerant capacity (RC) and relative cooling power (RCP) reach ~569 J/kg and ~733 J/kg at a field change of 5 T, respectively. These results suggest that the melt-extracted Gd19Tb19Er18Fe19Al25 microwires exhibit good MCE and have great potential to use as one kind of high temperature magnetic refrigeration material.

中文翻译：

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熔体提取高熵 Gd19Tb19Er18Fe19Al25 非晶微丝的磁热效应

摘要 本文系统地研究了熔体萃取法制备的高熵Gd19Tb19Er18Fe19Al25非晶微线的磁热效应(MCE)。这些微丝在居里温度为 97 K 时表现出从铁磁态到顺磁态的二阶相变。 当温度低于居里温度时，零场冷却 (ZFC) 和场冷却 (FC) 磁化曲线是不可逆的由于自旋玻璃态冻结行为。磁场从 0 到 5 T 变化的峰值磁熵变 ( Δ SM pk ) 达到 ~5.94 J/kg∙K。根据两个标准制冷剂容量，在 5 T 的场变化下，制冷剂容量 (RC) 和相对冷却功率 (RCP) 的值分别达到 ~569 J/kg 和 ~733 J/kg。