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L'influence de divers procédés de refroidissement sur la phase, la microstructure et les propriétés magnétocaloriques des composés de LaFe(11.6)Si(1.4).
The influence of different cooling processes on phase, microstructure and magnetocaloric properties of LaFe(11.6)Si(1.4) compounds.
Résumé
These compounds are annealed at 1503 K for 5 hours and cooled down to room temperature by furnace cooling, air cooling, and quenching in ice water, respectively. The main phase is the 1:13 phase in those compounds. The impurity phase is a-Fe, and the amount of LaFeSi phase is so small that it is hard to observe in their powder X-ray diffraction patterns (XRD). The XRD and SEM show that three cooling methods have little influence on the phase relation and microstructure of LaFe11.6Si1.4 compounds prepared by different cooling processes. For studying the influence of different cooling processes on magnetic property, the Curie temperature, thermal and magnetic hysteresis, magnetocaloric effect,and relative cooling power of those compounds are investigated. The result show that the maximum ?SM (T, H) and cooling power RCP of LaFe(11.6)Si(1.4) prepared by furnace cooling are both the largest in three compounds, and the value are 18.7 J/kg.K and 164.6 J/kg under a field change of 0-2 T, respectively.
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Détails
- Titre original : The influence of different cooling processes on phase, microstructure and magnetocaloric properties of LaFe(11.6)Si(1.4) compounds.
- Identifiant de la fiche : 30005483
- Langues : Anglais
- Source : 5th International Conference on Magnetic Refrigeration at Room Temperature (Thermag V). Proceedings: Grenoble, France, September 17-20, 2012.
- Date d'édition : 17/09/2012
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