Tunable Curie temperature around room temperature and magnetocaloric effect in ternary Ce–Fe–B amorphous ribbons

Tunable Curie temperature around room temperature and magnetocaloric effect in ternary Ce–Fe–B amorphous ribbons
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三元Ce–Fe–B非晶带材的室温可调居里温度及磁热效应

DOI:
10.1088/1361-6463/50/1/015002
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发表时间:
2017-01
期刊:
Journal of Physics D: Applied Physics
影响因子:
--
通讯作者:
Bao-gen Shen
Bao-gen Shen
中科院分区:
其他
文献类型:
--
作者:
Zhu-bai Li;Le-le Zhang;Xue-feng Zhang;Yong-feng Li;Qian Zhao;Tong-yun Zhao;Bao-gen Shen

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采用熔体旋压法制备了Ce13−xFe81+xB6(x=0,0.5,1,1.5,2)非晶磁体。这些磁体在低温下是软磁的,在室温附近经历了从铁磁状态到顺磁状态的二级相变,温度范围很宽。相变温度随Ce/Fe原子比的变化而变化,这主要是由于Ce-Fe-B三元非晶磁体中Fe原子配位数的变化所致。在磁场变化为0~2T和0~5T时,磁体的制冷量分别为116~150J kg−1和319~420J kg−1,与传统的室温制冷磁性材料相当。鉴于Fe和Ce的低成本,Ce-Fe-B非晶态磁体是有吸引力的磁制冷剂候选材料。
Ce 13− x Fe 81+ x B 6 (x= 0, 0.5, 1, 1.5, and 2) amorphous magnets were prepared by melt-spinning method. These magnets are magnetically soft at low temperature, and undergo a second-order phase transition from ferromagnetic to paramagnetic state near room temperature with a broad temperature span. The phase-transition temperature is tunable by the variation of the Ce/Fe atomic ratio, which is mainly due to the change of the coordination number of Fe atoms in these ternary Ce–Fe–B amorphous magnets. Though the entropy change is low, the refrigeration capacities are in the ranges of 116–150 J kg− 1 and 319–420 J kg− 1, respectively, for the magnetic field changes of 0–2 T and 0–5 T, which is comparable with those of conventional magnetic materials for room-temperature refrigeration. Given the low cost of Fe and Ce, Ce–Fe–B amorphous magnets are attractive magnetic refrigerant candidates.
DOI: 10.1016/j.jmmm.2015.04.046
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影响因子: 2.7
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