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Effect of carbon on magnetocaloric effect of LaFe11.6Si1.4 compounds and on the thermal stability of its hydrides

Teixeira, Cristiano S. ; Krautz, Maria ; Moore, James D. ; Skokov, Konstantin ; Liu, Jian ; Wendhausen, Paulo A. P. ; Gutfleisch, Oliver (2012)
Effect of carbon on magnetocaloric effect of LaFe11.6Si1.4 compounds and on the thermal stability of its hydrides.
In: Journal of Applied Physics, 111 (7)
doi: 10.1063/1.3675985
Article, Bibliographie

Abstract

La(Fe,Si)13 alloys display a giant magnetocaloric effect when a magnetic field is applied near the Curie temperatureT 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 interstitialcarbon on the microstructure and magnetocaloric effect in LaFe11.6Si1.4C x (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 LaFe11.6Si1.4C x . 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.

Item Type: Article
Erschienen: 2012
Creators: Teixeira, Cristiano S. ; Krautz, Maria ; Moore, James D. ; Skokov, Konstantin ; Liu, Jian ; Wendhausen, Paulo A. P. ; Gutfleisch, Oliver
Type of entry: Bibliographie
Title: Effect of carbon on magnetocaloric effect of LaFe11.6Si1.4 compounds and on the thermal stability of its hydrides
Language: English
Date: 2012
Publisher: AIP Publishing LLC
Journal or Publication Title: Journal of Applied Physics
Volume of the journal: 111
Issue Number: 7
DOI: 10.1063/1.3675985
Abstract:

La(Fe,Si)13 alloys display a giant magnetocaloric effect when a magnetic field is applied near the Curie temperatureT 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 interstitialcarbon on the microstructure and magnetocaloric effect in LaFe11.6Si1.4C x (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 LaFe11.6Si1.4C x . 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.

Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 May 2014 12:31
Last Modified: 19 May 2014 12:31
PPN:
Funders: The research leading to these results has received funding from the European Community’s 7th Framework Programme under grant agreement No. 214864 (SSEEC), from the European Commission Grant 155679-EM-1-2009-1-PT-ERAMUNDUS-ECW-L15,, The research leading to these results has received funding from CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior.
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