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Controlling of magnetocaloric effect in Gd2O3@SiO2 nanocomposites by substrate dimensionality and particles’ concentration

Opened Access Controlling of magnetocaloric effect in Gd2O3@SiO2 nanocomposites by substrate dimensionality and particles’ concentration

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Autor: Zelenáková, Adriana
Hubrovkák, Pavol
Kapusta, Ondrej
Berkutova, Anna
Zelenák, Vladimir
Franco García, Victorino
Departamento: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Fecha: 2017
Publicado en: AIP Advances, 8, 1-10.
Tipo de documento: Artículo
Resumen: The magnetocaloric effect (MCE) of hybrid nanostructures consisting of fine gadolinium oxide (Gd2O3) nanoparticles with diameter 7 nm and 12 nm loaded into the pores of the periodically ordered mesoporous silica with hexagonal (SBA-15) or cubic (SBA-16) symmetry were investigated. The concentration effect of the added nanoparticles (NPs) and the effect of the silica matrix dimensionality on the structural properties, magnetization M(H), magnetic entropy change SM, and parameters A(T) and B(T) derived from Arrott plots were studied in four samples. Examined nanocomposites exhibited reasonable high values of magnetic entropy change SM varying from 29 J/kgK established for Gd2O3@SBA-15 up to 64 J/kgK observed in Gd2O3@SBA-16 at maximal field change 5 T at low temperatures. This suggests that studied nanocomposites, where diamagnetic silica matrices serve as nanoreactors for growth of Gd2O3 nanoparticles and their symmetry strongly affect magnetic properties of whole composites, could be ...
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Cita: Zelenáková, A., Hubrovkák, P., Kapusta, O., Berkutova, A., Zelenák, V. y Franco García, V. (2017). Controlling of magnetocaloric effect in Gd2O3@SiO2 nanocomposites by substrate dimensionality and particles’ concentration. AIP Advances, 8, 1-10.
Tamaño: 10.59Mb
Formato: PDF

URI: https://hdl.handle.net/11441/71230

DOI: 10.1063/1.4993974

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