Comportamiento magnetocalórico en manganitas lantano-estroncio dopadas con cobalto

Itzel González-García; Félix  Sánchez-De Jesús; Omar  Rosales-González; Claudia Alicia Cortés-Escobedo; Ana María Bolarín-Miró

doi:10.29057/icbi.v10iEspecial7.9932

Itzel González-García Autonomous University of Hidalgo State https://orcid.org/0000-0001-9314-6743
Félix Sánchez-De Jesús Autonomous University of Hidalgo State https://orcid.org/0000-0002-9453-1755
Omar Rosales-González Autonomous University of Hidalgo State https://orcid.org/0000-0003-2948-438X
Claudia Alicia Cortés-Escobedo National Polytechnic Institute https://orcid.org/0000-0003-4824-2941
Ana María Bolarín-Miró Autonomous University of Hidalgo State https://orcid.org/0000-0002-2199-1208

DOI: https://doi.org/10.29057/icbi.v10iEspecial7.9932

Keywords: Magnetic refrigeration, magnetocaloric, manganite

Abstract

Magnetic refrigeration is one of the technologies with the greatest commercial potential, the application of this technology has not been realized due to the need to have magnetocaloric materials that work at room temperature (300 K) and with low magnetic fields (< 2 T). In this work was analyzed the effect of Co³⁺ substitution in Mn³⁺ positions in the lanthanum-strontium manganite, La_0.3Sr_0.7Co_xMn_1-xO₃ with x from 0.05 to 0.2 mol, with the objective of decreasing the working temperature, keeping the magnetic entropy value above 2.5 J/kg∙K and the cooling capacity higher than 80 J/K. By XRD and its analysis by Rietveld refinement, orthorhombic phases were confirmed for all concentrations. Vibrating sample magnetometry showed ferromagnetic order at room temperature and the Curie temperature decreased to 300 K for the concentration of x= 0.15, this suggests that the material may be a good candidate for magnetic refrigeration applications.

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