摘要
The crystal structure, itinerant-electron metamagnetic transition (IEMT) and magnetocaloric effect (MCE) in the iron-based rare-earth intermetallic compound La0.8Ce0.2Fe11.4Si1.6 have been investi- gated. The powder X-ray diffraction revealed that the ingot of La0.8Ce0.2Fe11.4Si1.6 annealed at 1373 K in vacuum for only 5 days could be crystallized in the cubic NaZn13-type structure. The La0.8Ce0.2Fe11.4Si1.6 compound exhibited giant values of the isothermal entropy change ?SM around the Curie temperature TC (about 186 K). And the maximum value ΔS M max is about 78.29 J/(kg·K) under a field change of 0—3 T, which can be calculated by the magnetization iso- therms around TC. Such a large MCE is attributed to the sharp change of magnetization and susceptibility around TC and the first-order magnetic transition of field-induced IEMT above TC.
The crystal structure, itinerant-electron metamagnetic transition （IEMT） and magnetocaloric effect （MCE） in the iron-based rare-earth intermetallic compound La0.8Ce0.2Fe11.4Si1.6 have been investigated. The powder X-ray diffraction revealed that the ingot of La0.8Ce0.2Fe11.4Si1.6 annealed at 1373 K in vacuum for only 5 days could be crystallized in the cubic NaZn13-type structure. The La0.8Ce0.2Fe11.4Si1.6 compound exhibited giant values of the isothermal entropy change ASM around the Curie temperature Tc（about 186 K）. And the maximum value ｜△SM｜max is about 78.29J/（kg.K） under a field change of 0-3 T, which can be calculated by the magnetization isotherms around Tc. Such a large MCE is attributed to the sharp change of magnetization and susceptibility around Tc and the first-order magnetic transition of field-induced IEMT above Tc.
基金
This work was supported by the National Natural Science Foundation of China （Grant No. 50164003）.
关键词
磁制冷材料
稀土
金属间化合物
磁热效应
La0.8Ce0.2Fe11.4Si1.6
magnetic refrigerant material, cubic NaZnl3-type intermetallic compounds, itinerant-electron metamagnetic transition, giant magnetocaloric effect.
