Li Luyi, Tang Benzhen, Fu Weijie, Lu Ying, Fu Yunqing, Ding Ding, Xia Lei, Yu Peng
Chongqing Key Laboratory of Photo-Electric Functional Materials, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China.
Institute of Materials & Laboratory for Microstructure, Shanghai University, Shanghai 200072, China.
Materials (Basel). 2023 Jun 24;16(13):4571. doi: 10.3390/ma16134571.
The new magnetic refrigeration (MR) technology, which uses the magnetocaloric effect (MCE) of materials for refrigeration, has shown apparent advantages over the compression refrigeration of freon and other gases. Therefore, how to obtain materials with excellent magnetic entropy change near room temperature is of great significance for the realization of MR. In order to achieve high Tc of a Gd-based amorphous alloy, GdCoAl amorphous alloy with good room temperature MCE was selected, and a series of GdCoFeAl (x = 2, 5, 10) amorphous alloys were prepared by adding Fe instead of Co. In this paper, the effect of Fe addition on the Curie temperature, and the magnetic entropy change in the alloys, were studied thoroughly. The results show that the Curie temperature is increased to 281 K by adding 5% Fe elements, which is mainly related to the enhanced 3-3 interaction of transition elements caused by Fe addition, and the maximum value of magnetic entropy change is 3.24 J/(kg·K) under a field of 5 T. The results are expected to provide guidance for further improving the room temperature MCE of Gd-based amorphous alloys.
新型磁制冷（MR）技术利用材料的磁热效应（MCE）进行制冷，已显示出相对于氟利昂及其他气体压缩制冷的明显优势。因此，如何获得室温附近具有优异磁熵变的材料对于磁制冷的实现具有重要意义。为了实现钆基非晶合金的高居里温度，选择了具有良好室温磁热效应的钆钴铝非晶合金，并通过添加铁替代钴制备了一系列钆钴铁铝（x = 2、5、10）非晶合金。本文深入研究了铁添加量对合金居里温度及磁熵变的影响。结果表明，添加5%的铁元素可使居里温度提高到281 K，这主要与铁添加导致的过渡元素3-3相互作用增强有关，在5 T磁场下磁熵变的最大值为3.24 J/(kg·K)。这些结果有望为进一步提高钆基非晶合金的室温磁热效应提供指导。
