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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. and Krautz, Maria and Moore, James D. and Skokov, Konstantin and Liu, Jian and Wendhausen, Paulo A. P. and 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, AIP Publishing LLC, pp. 07A927, 111, (7), ISSN 00218979,
[Online-Edition: http://dx.doi.org/10.1063/1.3675985],
[Article]

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. and Krautz, Maria and Moore, James D. and Skokov, Konstantin and Liu, Jian and Wendhausen, Paulo A. P. and Gutfleisch, Oliver
Title: Effect of carbon on magnetocaloric effect of LaFe11.6Si1.4 compounds and on the thermal stability of its hydrides
Language: English
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.

Journal or Publication Title: Journal of Applied Physics
Volume: 111
Number: 7
Publisher: AIP Publishing LLC
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
Official URL: http://dx.doi.org/10.1063/1.3675985
Identification Number: doi:10.1063/1.3675985
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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