Enhancement of magnetocaloric effect in mischmetal doped La-Fe-Si alloys

Enhancement of magnetocaloric effect in mischmetal doped La-Fe-Si alloys
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混合稀土掺杂 La-Fe-Si 合金中磁热效应的增强

DOI:
10.1063/1.5006089
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发表时间:
2018-05
期刊:
影响因子:
1.6
通讯作者:
Zhang Yan
Zhang Yan
中科院分区:
材料科学4区
文献类型:
--
作者:
Wang Gaofeng;Zhao Zengru;Zhang Xuefeng;Ma Qiang;Li Yongfeng;Liu Yanli;Mu Lijuan;Zhang Yan

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研究了混合稀土的部分取代对La1-xMxFe11.5Si1.5合金的结构、居里温度和磁热效应的影响。 X射线衍射图表明合金主要以NaZn13型立方结构结晶,混合稀土掺杂合金中二次α-Fe相的数量明显减少。随着混合稀土含量的增加,居里温度从 x = 0 时的 198.1 K 降低到 x = 0.3 时的 184.2 K,热滞现象从 x = 0 时的 3.5 K 增大到 x = 0.3 时的 8.2 K。当场从 0 T 变化到 3 T 时,当 x = 0、0.1、0.2 和 0.3 时,获得的最大等温熵变值分别为 17.2、19.8、37.8 和 47.9 J/kgK。当 x = 0、0.1、0.2 和 0.3 时,由一级跃迁潜热引起的熵变化估计分别为 11.3、14.7、18.5 和 23.4 J/kgK。 La1-xMxFe11.5Si1.5合金中巨磁热MCE的增强源于增强的巡回电子偏磁...
The influence of partial substitution of mischmetal on the structure, Curie temperature and magnetocaloric effect has been investigated in La1-xMxFe11.5Si1.5 alloys. X-ray diffraction patterns indicate the alloys crystallize mainly in NaZn13-type cubic structure and the amount of secondary α-Fe phase obviously reduces in the mischmetal doped alloys. As the content of mischmetal increases, the Curie temperature is reduced from 198.1 K for x = 0 to 184.2 K for x = 0.3 and the thermal hysteresis is enlarged from 3.5 K for x = 0 to 8.2 K for x = 0.3. Upon a field change from 0 to 3 T, the obtained maximum isothermal entropy change values are 17.2, 19.8, 37.8 and 47.9 J/kgK for x = 0, 0.1, 0.2 and 0.3, respectively. The entropy changes due to the latent heat of first-order transitions are estimated to be 11.3, 14.7, 18.5 and 23.4 J/kgK for x = 0, 0.1, 0.2 and 0.3, respectively. The enhancement of giant magnetocaloric MCE in La1-xMxFe11.5Si1.5 alloys originates from the strengthened itinerant electron metamagne...
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