期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 324, 期 4, 页码 484-487出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2011.08.028
关键词
Magnetocaloric effect; Hysteresis loss; Refrigerant capacity
资金
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- China Postdoctoral Science Foundation
- National Basic Research Program of China
The effects of introducing Ce and C atoms on the Curie temperature (T-C), the magnetic entropy change (Delta S-M) and the hysteresis loss have been investigated in the NaZn13-type LaFe11.5Si1.5 compound. Partial replacement of La with Ce leads to a decrease in T-C and an increase in Delta S-M; however, the introduction of interstitial C atoms can adjust T-C to high temperature. The itinerant-electron metamagnetic transition is weakened after carbonization, which results in a reduction of both the hysteresis loss and magnetocaloric effect (MCE). The maximum value of Delta S-M for La0.8Ce0.2Fe11.5Si1.5C0.2 is found to be -28 J/kg K at T-C=207 K with an effective refrigeration capacity of 420 J/kg for a field change from 0 to 5 T. Our study reveals that the enhancements of both T-C and MCEs can be achieved simultaneously in the La-1 xCexFe11.5Si1.5Cy compounds by adjusting the concentrations of Ce and C atoms appropriately. (C) 2011 Elsevier B.V. All rights reserved.
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