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Refrigerant capacity and direct measurements of the magnetocaloric effect on LaFe11.2Co0.7Si1.1Cx materials.
- Source :
- Journal of Applied Physics; May2010, Vol. 107 Issue 9, p09A933-1-09A933-3, 3p
- Publication Year :
- 2010
-
Abstract
- In this paper, we report on the magnetic properties and magnetocaloric effect (MCE) in NaZn<subscript>13</subscript>-type LaFe<subscript>11.2</subscript>Co<subscript>0.7</subscript>Si<subscript>1.1</subscript>C<subscript>x</subscript> (x=0.1 and 0.3) close to room temperature. The Landau theory as well as the temperature dependence of magnetization data revealed that LaFe<subscript>11.2</subscript>Co<subscript>0.7</subscript>Si<subscript>1.1</subscript>C<subscript>0.1</subscript> and LaFe<subscript>11.2</subscript>Co<subscript>0.7</subscript>Si<subscript>1.1</subscript>C<subscript>0.3</subscript> exhibit a second-order magnetic transition near their Curie temperature. We have calculated the magnetocaloric effect both in terms of isothermal entropy change and adiabatic temperature change using the magnetization and the direct measurements. Under an external field change from 0 to 5 T, -ΔS is 14.5 J/kg K (T<subscript>C</subscript>=290 K) and 8 J/kg K (T<subscript>C</subscript>=310 K) for x=0.1 and 0.3, respectively. The calculated refrigerant capacity for a field change in 0-5 T is about 305 and 286 J/kg K, for LaFe<subscript>11.2</subscript>Co<subscript>0.7</subscript>Si<subscript>1.1</subscript>C<subscript>0.1</subscript> and LaFe<subscript>11.2</subscript>Co<subscript>0.7</subscript>Si<subscript>1.1</subscript>C<subscript>0.3</subscript>respectively, which is larger than that of some magnetocaloric materials with a first-order phase transition (Gd<subscript>5</subscript>Ge<subscript>2</subscript>Si<subscript>2</subscript>). ΔT<subscript>ad</subscript> decreases with increasing C content. It was found to be about 1.5 for x=0.1 and 1.2 for x=0.3 under 1.48 T. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 107
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 98309545
- Full Text :
- https://doi.org/10.1063/1.3349372