STRUCTURAL AND MAGNETIC PROPERTIES OF MIXED-VALENCE MANGANITES

dc.contributor.authorشريفه عبدالله مجيليب الحلافي
dc.date2021
dc.date.accessioned2022-05-18T03:40:36Z
dc.date.available2022-05-18T03:40:36Z
dc.degree.departmentكلية العلوم
dc.degree.grantorJouf University
dc.description.abstractThe purpose of this work is to present the findings of an experimental analysis of structural, magnetic, and magnetocaloric properties of the nanocrystalline manganites, La0.8Sr0.15Na0.05MnO3 (LSNMO), with size about 50 nm elaborated via solgel route. X-ray diffraction presents that LSNMO crystallize in a rhombohedral structure with the 3Rc space group. Magnetic characterizations demonstrate that LSMNO exhibits a coexistence of interacting superparamagnetic (ISPM) phase with blocking temperature TB = 194 K and a ferromagnetic phase with Curie temperature TC = 255.5 K. At low temperatures, the SPM state undergoes a collective freezing state at Tf = 46 K. The maximum magnetic entropy change ( M pk S ) is about 1.41 Jkg-1K-1 and the refrigeration capacity (RC) is 288 JKg-1 for a field change of 5 T at T = 215 K. The magnetocaloric response is reasonably high compared to the bulk materials, and this makes nanoparticles of LSMNO a potential candidate material for active magnetic refrigerators.
dc.identifier.other7382
dc.identifier.urihttps://drepo.sdl.edu.sa/handle/20.500.14154/414
dc.language.isoar_SA
dc.publisherSaudi Digital Library
dc.thesis.levelMaster
dc.thesis.sourceJouf University
dc.titleSTRUCTURAL AND MAGNETIC PROPERTIES OF MIXED-VALENCE MANGANITES
dc.typeThesis

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