Table-like magnetocaloric effect of Fe88-xNdxCr8B4 composite materials
Table-like magnetocaloric effect of Fe88-xNdxCr8B4 composite materials
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DOI：
10.1016/j.jmmm.2015.04.046
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发表时间：
2015-09-15
影响因子：
2.7
通讯作者：
Zeng, D. C.
中科院分区：
文献类型：
--
作者：
Lai, J. W.;Zheng, Z. G.;Zeng, D. C.
由于垂直棒的磁熵变化δ S-M峰值和较大的热滞或磁滞，使得工作温度范围狭窄，限制了磁热材料的实际应用。采用电弧熔炼-熔体纺丝法制备了以不同Nd取代Fe （x=5、8、10、12和15）的Fe88-xNdxCr8B4合金多层复合材料，得到了表状磁热效应（MCE）。发现Nd的变位增强了玻璃的形成能力。当Nd取代量为5 ~ 15 at%时，居里温度（T- c）在322 ~ 350 K之间，在0 ~ 5 T的施加温度下，垂杆δ S-M的峰值基本保持在3.4 ~ 3.5 J/(kg K)之间。在超过40 K的宽温度范围内，在0-5 T的变化范围内，复合材料的垂直杆δ S-M接近于3.2 J/(kg K)的接近恒定值，导致制冷剂容量达到>408 J/kg。该竖杆δ S-M竖杆值远大于以往报道的fe基非晶复合材料Fe78-xCexSi4Nb5B12Cu1。该复合材料可作为室温下爱立信循环磁再生制冷机的工作材料。(C) 2015 Elsevier B.V.版权所有
The narrow working temperature range due to the sharp magnetic entropy change vertical bar Delta S-M vertical bar peak and large thermal or magnetic hysteresis restricts the practical application of magnetocaloric materials. In this work, the table-like magnetocaloric effect (MCE) was obtained in the multilayer composite of Fe88-xNdxCr8B4 alloys with various Nd substitutions for Fe (x=5, 8, 10, 12, and 15), which were prepared by arc-melting followed by melt-spinning. The substation of Nd was found to enhance the glass-forming ability. For the alloys with Nd substitution from 5 at% to 15 at%, the Curie temperature (T-C) ranged from 322 K to 350 K and the peak value of vertical bar Delta S-M vertical bar remained almost constant, 3.4-3.5 J/(kg K) under an applied held of 0-5 T The composite with various Nd contents was prepared by stocking the ribbons layer by layer. The vertical bar Delta S-M vertical bar of the composite approached a nearly constant value of similar to 3.2 J/(kg K) in a held change of 0-5 T in a wide temperature span over 40 K, resulting in large refrigerant capacity value of >408 J/kg. This vertical bar Delta S-M vertical bar value was much larger than the previous reported Fe-based amorphous composite Fe78-xCexSi4Nb5B12Cu1. This composite can be used as the working material in the Ericsson-cycle magnetic regenerative refrigerator around room temperature. (C) 2015 Elsevier B.V. All rights reserved.