Journal
JOURNAL OF APPLIED PHYSICS
Volume 111, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3675985
Keywords
-
Categories
Funding
- European Community [214864]
- European Commission [155679-EM-1-2009-1-PT-ERAMUNDUS-ECW-L15]
- CAPES - Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior
Ask authors/readers for more resources
La(Fe,Si)(13) alloys display a giant magnetocaloric effect when a magnetic field is applied near the Curie temperature T-C. However, to use these alloys for domestic refrigeration based on magnetic cooling, it is vital to increase T-C near to the room-temperature range while simultaneously maintaining a large magnetocaloric effect. With this aim, we studied the effect of interstitial carbon on the microstructure and magnetocaloric effect in LaFe11.6Si1.4Cx (x = 0-0.4). The investigation was carried out in cast samples annealed for seven days at 1323 K. The study of microstructure shows that annealing led to about 90 wt. % of 1:13 magnetocaloric phase. Magnetization data revealed that the addition of carbon leads to an increase in T-C and a decrease of the thermal hysteresis width. For x > 0.2, the magnetic transition changes from first-order to second-order, with a corresponding reduction in magnetocaloric effect. A small amount of C (x up to 0.2) improves the magnetocaloric properties of the parent alloy La(Fe,Si)(13), and, furthermore, the carbon addition leads to an increase in the thermal stability of hydrided LaFe11.6Si1.4Cx. The onset of hydrogen desorption increases from 460 K for the x = 0 (carbon-free alloy) to 500 K and 540 K, respectively, for x = 0.1 and x = 0.2. (C) 2012 American Institute of Physics. [doi:10.1063/1.3675985]
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available