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, 111 (7), pp. 07A927. AIP Publishing LLC, ISSN 00218979,
[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 |
| Journal 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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