Ambient pressure colossal magnetocaloric effect tuned by composition in Mn1-xFexAs
Ambient pressure colossal magnetocaloric effect tuned by composition in Mn1-xFexAs
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DOI：
10.1038/nmat1732
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发表时间：
2006-10-01
期刊：
影响因子：
41.2
通讯作者：
De Oliveira, Nilson A.
中科院分区：
文献类型：
--
作者：
De Campos, Ariana;Rocco, Daniel L.;De Oliveira, Nilson A.
磁热效应（MCE）是磁制冷的基础，由于其优越的效率和环境友好性，可以取代传统的气体压缩技术(1-3)。 MCE 材料必须表现出响应绝热磁场变化的大温度变化，并且还期望出现大的等温熵效应。在这方面，MnAs 显示出巨大的 MCE，但该效应出现在高压下 (4)。在这项工作中，我们报告了 Mn1-xFexAs 在环境压力下表现出巨大效应的特性。 MCE 峰值从 285K 到 310K 不等，具体取决于 Fe 浓度。尽管观察到较大的热滞后，但环境压力下的巨大效应使得具有巨大制冷功率的层状磁蓄热体更接近室温附近的实际应用。
The magnetocaloric effect (MCE) is the basis for magnetic refrigeration, and can replace conventional gas compression technology due to its superior efficiency and environment friendliness(1-3). MCE materials must exhibit a large temperature variation in response to an adiabatic magnetic-field variation and a large isothermal entropic effect is also expected. In this respect, MnAs shows the colossal MCE, but the effect appears under high pressures(4). In this work, we report on the properties of Mn1-xFexAs that exhibit the colossal effect at ambient pressure. The MCE peak varies from 285K to 310K depending on the Fe concentration. Although a large thermal hysteresis is observed, the colossal effect at ambient pressure brings layered magnetic regenerators with huge refrigerating power closer to practical applications around room temperature.