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

A. Zeleňáková | Zendy; Pavol Hrubovčák | Zendy; Ondrej Kapusta | Zendy; A. Berkutova | Zendy; Vladimı́r Zeleňák | Zendy; V. Franco | Zendy

Open Access

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

Author(s) -

A. Zeleňáková,

Pavol Hrubovčák,

Ondrej Kapusta,

A. Berkutova,

Vladimı́r Zeleňák,

V. Franco

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4993974

Subject(s) - magnetic refrigeration , materials science , nanocomposite , nanoparticle , mesoporous silica , diamagnetism , mesoporous material , magnetization , nanotechnology , chemical engineering , magnetic field , chemistry , catalysis , biochemistry , physics , quantum mechanics , engineering

The magnetocaloric effect (MCE) of hybrid nanostructures consisting of fine gadolinium\udoxide (Gd2O3) nanoparticles with diameter 7 nm and 12 nm loaded into\udthe pores of the periodically ordered mesoporous silica with hexagonal (SBA-15)\udor cubic (SBA-16) symmetry were investigated. The concentration effect of the\udadded nanoparticles (NPs) and the effect of the silica matrix dimensionality on\udthe structural properties, magnetization M(H), magnetic entropy change SM, and\udparameters A(T) and B(T) derived from Arrott plots were studied in four samples.\udExamined nanocomposites exhibited reasonable high values of magnetic entropy\udchange SM varying from 29 J/kgK established for Gd2O3@SBA-15 up to 64 J/kgK\udobserved in Gd2O3@SBA-16 at maximal field change 5 T at low temperatures.\udThis suggests that studied nanocomposites, where diamagnetic silica matrices serve\udas nanoreactors for growth of Gd2O3 nanoparticles and their symmetry strongly\udaffect magnetic properties of whole composites, could be feasible for cryomagnetic\udrefrigeration applicationsPeer reviewe

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