Structural Analysis and Theoretical Investigations of the Magnetocaloric Effect for La0.7Ba0.15Ag0.15MnO3 Manganite Prepared Using Sol-Gel Route
| Autor: | Michel Boudard, Mohamed Hsini, Mohamed Lamjed Bouazizi, Sobhi Hcini, Hussein Al Robei |
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| Přispěvatelé: | Laboratoire des matériaux et du génie physique (LMGP ), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Phase transition Materials science Condensed matter physics Rietveld refinement [CHIM.MATE]Chemical Sciences/Material chemistry Condensed Matter Physics Manganite 01 natural sciences 7. Clean energy Landau theory Electronic Optical and Magnetic Materials Magnetic field Condensed Matter::Materials Science Paramagnetism Ferromagnetism 0103 physical sciences Magnetic refrigeration 010306 general physics ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Superconductivity and Novel Magnetism Journal of Superconductivity and Novel Magnetism, Springer Verlag, 2020, 33 (11), pp.3597-3605. ⟨10.1007/s10948-020-05615-x⟩ |
| ISSN: | 1557-1939 1557-1947 |
| Popis: | Structural analysis, magnetocaloric properties, and theoretical investigations of the magnetocaloric effect were carried out in the crystalline La0.7Ba0.15Ag0.15MnO3 manganite prepared using sol-gel route. The phase purity and structure of this sample were checked by X-ray diffraction technique and Rietveld analysis. From magnetic measurements, the ferromagnetic to paramagnetic (FM-PM) phase transition was observed around TC = 255 K. The maximum change in magnetic entropy ( $$ \Delta {S}_M^{max} $$ ) and relative cooling power (RCP) extracted from magnetic measurements were 3.48 J × kg-1 × K-1 and 225 J × kg-1 at an applied magnetic field of 5 T. These magnetocaloric parameters offer to the sample the possible use in the magnetic refrigeration technology. The magnetic entropy simulation by using different theories such as the Weiss molecular mean-field theory and the Landau theory shows good correlation between the theoretical values of −∆SM(T) and the experimental ones estimated from Maxwell relation. |
| Databáze: | OpenAIRE |
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