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The magnetic entropy change in La0.8Ce0.2Fe11.4Si1.6Bx compounds prepared by copper-mold casting |
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| Authors: | Zhiping LinShandong Li Ming LiuSu-Yueh Tsai Jenq-Gong DuhMeimei Liu Feng Xu |
| Affiliation: | a Department of Physics, Fujian Normal University, Fuzhou 350007, China b Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA c EPMA Lab, Precision Instrument Center, National Tsing Hua University, Hsinchu 30013, Taiwan d Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan e Ningbo Institute of Material Technology & Engineering, Chinese Academy of Science, Ningbo 350201, China f Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
| Abstract: | The magnetocaloric effect (MCE) of La0.8Ce0.2Fe11.4Si1.6Bx (x=0.0-0.5) compounds, prepared by a copper-mold casting (CMC) method, has been investigated. Comparing with the conventional arc-melting (CAM) method, the relatively homogenous composition and microstructure were achieved in the precursor alloys prepared by the CMC method. As a result, the annealing time is dramatically shortened from several weeks for CAM alloys to 2 h for CMC alloys, suggesting that CMC method is a time-saving and energy-saving method for fabrication of MCE alloys. On the other hand, it is revealed that B addition gives rise to an enhancement of Curie temperature (TC), a reduction of thermal lag and magnetic hysteresis and a broadening of working temperature span as well. Although the peak value of magnetic entropy change decreases with B content, various B-contained compounds hold close refrigerant capacities. Comprehensively considering magnetocaloric properties of the B-contained La0.8Ce0.2Fe11.4Si1.6Bx compounds, it can be concluded that the B-contained compounds prepared by CMC method are promising candidates of magnetocaloric materials in practical application. |
| Keywords: | Magnetocaloric effect Copper-mold casting Thermal lag Magnetic hysteresis |
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