Achieving table-like magnetocaloric effect and large refrigerant capacity around room temperature in Fe78−xCexSi4Nb5B12Cu1 (x=0–10) composite materials
Achieving table-like magnetocaloric effect and large refrigerant capacity around room temperature in Fe78−xCexSi4Nb5B12Cu1 (x=0–10) composite materials
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DOI：
10.1016/j.matlet.2014.09.127
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发表时间：
2015
影响因子：
3
通讯作者：
H. Tian;X. Zhong;Zuolian Liu;Z. G. Zheng;Jun Min
中科院分区：
文献类型：
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作者：
H. Tian;X. Zhong;Zuolian Liu;Z. G. Zheng;Jun Min
通过熔体旋压制备全非晶 Fe78−xCexSi4Nb5B12Cu1(x=0、1、3、5 和 10) 合金带材。通过部分Ce替代Fe，居里温度可以在465至281 K的大温度范围内调节，磁场变化从0至5 T的最大磁熵变（-ΔSM）从3.25 J/kg K降低至2.18 J/kg K。通过逐层组装带材或混合不同Ce含量的粉末，获得了两种不同Ce含量的复合材料。在这些复合材料中观察到了类似表格的磁热效应（MCE）。在超过 80 K 的宽温度范围内，当场变化为 0-5 T 时，复合材料的 -ΔSM 接近约 2.0 J/kg K 的恒定值，从而产生较大的制冷剂容量值，>370 J/kg。这些复合材料可用作室温附近主动磁再生制冷机的工作材料。
Fully amorphous Fe78−xCexSi4Nb5B12Cu1(x=0, 1, 3, 5 and 10) alloy ribbons were prepared by melt-spinning. With partial substitution of Ce for Fe, the Curie temperature could be tuned in a large temperature range from 465 to 281 K and the maximum magnetic entropy change (−ΔSM) for a field change from 0 to 5 T decreased from 3.25 to 2.18 J/kg K. Two types of composite materials with varied Ce contents were obtained by assembling the ribbons layer by layer or mixing the powders with various Ce contents. A table-like magnetocaloric effect (MCE) was observed in these composites. The −ΔSMof the composites approach a nearly constant value of ~2.0 J/kg K for a field change of 0–5 T in a wide temperature span over 80 K, resulting in large refrigerant capacity values, >370 J/kg. These composites can be used as the working material in an active magnetic regenerative refrigerator around room temperature.