https://doi.org/10.1140/epjp/s13360-022-03153-0
Regular Article
Large magnetocaloric effect in 0.25(La0.67Ca0.33MnO3 + La0.67Ca0.13Sr0.2Mn0.98Ni0.02O3) /0.5 La0.67Ca0.23Sr0.1Mn0.98Ni0.02O3 composite close to room temperature
1
Laboratoire de Physique Quantique Et Statistique, Faculté Des Sciences de Monastir, Université de Monastir, Avenue de l’Environnement, 5019, Monastir, Tunisia
2
UNIROUEN, INSA Rouen, CNRS, GPM, Normandie Université, 76000, Rouen, France
3
Laboratoire de Physique de La Matière Condensée Et Des Nanosciences, Faculté Des Sciences de Monastir, Université de Monastir, Avenue de l’Environnement, 5019, Monastir, Tunisia
Received:
6
April
2022
Accepted:
5
August
2022
Published online:
20
August
2022
Magnetic and magnetocaloric properties of a composite based on a mixture of several Sr and Ni doped La0.67Ca0.33MnO3 compounds with distinct magnetic features are investigated. All of the specimens were produced by the standard sol–gel method. The crystallographic quality and elemental composition were checked by X-ray diffraction and SEM analyses. The magnetic behavior of the composite can be tuned by the relative proportion of each parent compound. Distinct magnetic transition near room temperature are observed, leading to three different optimal values of the magnetic entropy change ΔSM in the presence of a magnetic field ranging between 0 and 5 T. We used the figure of merit such as temperature-averaged entropy change (TEC) for comparisons of magnetocaloric performance of the specimens. The relative cooling power RCP is improved by 45–58% as compared to the parent materials. Thus, the composite possesses an advantage in terms of high cooling power, which paves the way for a method to potentially improve the RCP of magnetocaloric materials.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
