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| Magnetocaloric effect of LaFe11.9-xCoxSi1.1B0.2( x=0.7, 0.8, 0.9) |
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Cite this article:
. Magnetocaloric effect of LaFe11.9-xCoxSi1.1B0.2( x=0.7, 0.8, 0.9). Acta Metall Sin, 2008, 44(3): 371-374 .
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Abstract The LaFe11.9-xCoxSi1.1B0.2 (x=0.7, 0.8, 0.9) compounds were prepared by arc melting. X-ray diffraction analysis shows that the phases of LaFe11.9-xCoxSi1.1B0.2 (x=0.7, 0.8, 0.9) compounds mainly consist of the NaZn13-type cubic structure phase and a small amount of the a-Fe phase. The space group is Fm-3c. It is found that the lattice parameters and the lattice volumes have slightly increase with increasing x. the lattice parameters are found to be 11.487,11.496 and 11.498 Å and the lattice volume is found to be 1515.9,1519.4 and 1519.9 Å3 for x=0.7, 0.8 and 0.9. The magnetic measurement shows that the Curie temperature of the compounds have slightly increased with increasing Co and near the room temperature, 270, 290 and 300 K for x=0.7, 0.8 and 0.9. The maximum values of the magnetic entropy change of LaFe11.9-xCoxSi1.1B0.2 compounds are 7.47, 5.93 and 5.90 Jkg-1K-1 for x=0.7, 0.8 and 0.9 for a field change from 0 to 1.5 T. It markedly exceeds that of pure Gd at the corresponding applied field. The relative cooling power (RCP) based on the magnetic entropy change is as large as that of pure Gd at the corresponding applied field.
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Received: 03 July 2007
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