Aspectos estructurales y propiedades magnéticas de la Ferrobismutita de Disprosio Dy2Bi2Fe4O12

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dc.contributor.advisorRoa Rojas, Jairo
dc.contributor.authorNieto Camacho, Johann Andrés
dc.contributor.researchgroupGrupo de Física de Nuevos Materialesspa
dc.date.accessioned2021-05-31T22:23:24Z
dc.date.available2021-05-31T22:23:24Z
dc.date.issued2021-01-20
dc.descriptiondiagramas, ilustraciones a color, fotografías, tablasspa
dc.description.abstractEl material de tipo perovskita doble Dy2Bi2Fe4O12 fue sintetizado a partir de la técnica de estado sólido. La caracterización estructural, mediante difracción de rayos x, revela un cristal ortorrómbico perteneciente al grupo espacial Pnma (#62) con fuertes distorsiones octaédricas. El análisis morfológico mediante SEM muestra una difusión granular con tamaños promedios del orden nanométrico. El espectro de energía por dispersión de rayos X señala que no hay elementos diferentes a los esperados de los óxidos precursores y en la proporción estequiométrica calculada. La determinación de la banda prohibida Eg=1.88 eV, a partir de espectroscopía por reflectancia difusa, clasifica a Dy2Bi2Fe4O12 como un material semiconductor. Las curvas de corriente contra voltaje sugieren una respuesta eléctrica no lineal de tipo varistor. Además, su permitividad eléctrica está marcada por polarización de tipo Maxwell-Wagner. La respuesta magnética clasifica a esta perovskita doble como un ferromagneto blando con bajo campo coercitivo (500 Oe < HC < 700 Oe) y magnetización remanente (2.15x10-4 emu/g < MR < 3.25x10-4 emu/g). Las curvas de histéresis muestran un comportamiento ferromagnético con evidencia de efectos superparamagnéticos debido a la presencia de granos nanométricos ferromagnéticos.spa
dc.description.abstractDouble perovskite-like material Dy2Bi2Fe4O12 has been obtain using the solid-state synthesis Structural characterization through X-ray diffraction technique reveals an orthorhombic crystal belonging to Pnma space group (# 62) with strong octahedral distortions. Analysis of the Morphology by SEM shows a granular diffusion with nanometric order mean sizes. X-ray energy dispersion spectra establishes that there are no elements other than those expected from the precursor oxides in the stoichiometric proportions calculated. Determination of the band gap Eg = 1.88 eV from diffuse reflectance spectroscopy classifies Dy2Bi2Fe4O12 as a semiconductor material. The I-V curves suggest a non-linear varistor-type electrical response. Furthermore, its electrical permittivity is marked by Maxwell-Wagner-type polarization. The magnetic response of the material shows a soft ferromagnet with low coercive field (500 Oe < HC <700 Oe) and remnant magnetization (2.15x10-4 emu/g < MR <3.25x10-4 emu/g). Hysteresis curves reveal a ferromagnetic response with evidence of superparamagnetic effects due to the significant presence of nano-sized ferromagnetic grains.eng
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Ciencias - Físicaspa
dc.description.researchareaCaracterización y Síntesis de Nuevos Materialesspa
dc.format.extent1 recurso en línea (88 páginas)spa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/79581
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.departmentDepartamento de Físicaspa
dc.publisher.facultyFacultad de Cienciasspa
dc.publisher.placeBogotáspa
dc.publisher.programBogotá - Ciencias - Maestría en Ciencias - Físicaspa
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dc.relation.references[99] L. Ren et al., “Tuning Magnetism and Photocurrent in Mn-Doped Organic-Inorganic Perovskites,” J. Phys. Chem. Lett., vol. 11, no. 7, pp. 2577–2584, Apr. 2020, doi: 10.1021/acs.jpclett.0c00034.spa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial-SinDerivadas 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/spa
dc.subject.ddc530 - Física::538 - Magnetismospa
dc.subject.otherFerromagnetismo
dc.subject.otherFerromagnetism
dc.subject.otherPropiedades magnéticas
dc.subject.otherMagnetic properties
dc.subject.proposalPerovskitaspa
dc.subject.proposalPerovskita doblespa
dc.subject.proposalEstructura cristalinaspa
dc.subject.proposalperovskita semiconductoraspa
dc.subject.proposalpropiedades magnéticasspa
dc.subject.proposalcaracterización estructuralspa
dc.subject.proposalgap ópticospa
dc.subject.proposalCrystal structureeng
dc.subject.proposalFerromagnetic perovskite-like materialeng
dc.subject.proposalStructural and morphological analysiseng
dc.subject.proposalElectric featureeng
dc.subject.proposalSemiconductor charactereng
dc.subject.proposalOptical band gapeng
dc.subject.proposalSoft ferromagneteng
dc.titleAspectos estructurales y propiedades magnéticas de la Ferrobismutita de Disprosio Dy2Bi2Fe4O12spa
dc.title.translatedStructural aspects and magnetic properties of Dysprosium Ferrobismutite Dy2Bi2Fe4O12eng
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.redcolhttp://purl.org/redcol/resource_type/TMspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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