Low-Temperature Heat Capasity Measurements in Gd-Based Nanocomposites

A. Berkutovaa, A. Zelenakovaa, P. Hrubovcaka, b, O. Kapustaa, R. Tarasenkoa, V. Zelenakc aDepartment of Condensed Matter Physics, University of P.J. Šafárik, Park Angelinum 9, 04001 Košice, Slovakia bFrank Laboratory of Neutron Physics, JINR, Dubna, Russia cDepartment of Inorganic Chemistry, University of P.J. Šafárik, Moyzesova 11, 04001 Košice, Slovakia

Full Text PDF

The magnetocaloric effect (MCE) of hybrid nanostructure consisting of fine gadolinium oxide (Gd2O3) nanoparticles with diameter up to 12 nm loaded into the pores of the periodically ordered mesoporous silica with cubic (SBA-16) symmetry were investigated. These studies were mainly based on heat capacity Cp measurements in temperature range 0.4-55 K under external magnetic field from 0 to 9 T. After the subtraction of lattice heat capacity contribution, the maximum of isothermal magnetic entropy change ΔSM=33 J/(K kg) and value of refrigerant capacity power RCP ~170 J/kg was obtained at temperature 2.5 K. Our findings confirm that this kind of nanocomposites can be promising for future refrigeration technology applications.

DOI:10.12693/APhysPolA.137.911 topics: magnetocaloric effect, Gd2O3 nanoparticles, nanoporous materials, magnetic entropy change, heat capacity