Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)

ilustraciones, fotografías, gráficas, tablas

Autores:: Cardona Vásquez, Jorge Andrés

Tipo de recurso:: Doctoral thesis

Fecha de publicación:: 2022

Institución:: Universidad Nacional de Colombia

Repositorio:: Universidad Nacional de Colombia

Idioma:: spa

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dc.title.spa.fl_str_mv	Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)
dc.title.translated.eng.fl_str_mv	Synthesis and characterization of the new material with triple perovskite structure R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 and 1.5)
title	Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)
spellingShingle	Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5) 620 - Ingeniería y operaciones afines::621 - Física aplicada Manganita Perovskita Refinamiento Rietveld Susceptibilidad magnética Impedancia compleja Perovskite Manganite Rietveld refinement Magnetic susceptibility Complex impedance Tecnología de materiales Magnetismo Propiedad eléctrica Materials engineering Magnetism Electrical properties
title_short	Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)
title_full	Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)
title_fullStr	Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)
title_full_unstemmed	Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)
title_sort	Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)
dc.creator.fl_str_mv	Cardona Vásquez, Jorge Andrés
dc.contributor.advisor.spa.fl_str_mv	Roa Rojas, Jairo
dc.contributor.author.spa.fl_str_mv	Cardona Vásquez, Jorge Andrés
dc.contributor.researchgroup.spa.fl_str_mv	Grupo de Física de Nuevos Materiales
dc.subject.ddc.spa.fl_str_mv	620 - Ingeniería y operaciones afines::621 - Física aplicada
topic	620 - Ingeniería y operaciones afines::621 - Física aplicada Manganita Perovskita Refinamiento Rietveld Susceptibilidad magnética Impedancia compleja Perovskite Manganite Rietveld refinement Magnetic susceptibility Complex impedance Tecnología de materiales Magnetismo Propiedad eléctrica Materials engineering Magnetism Electrical properties
dc.subject.proposal.spa.fl_str_mv	Manganita Perovskita Refinamiento Rietveld Susceptibilidad magnética Impedancia compleja
dc.subject.proposal.eng.fl_str_mv	Perovskite Manganite Rietveld refinement Magnetic susceptibility Complex impedance
dc.subject.unesco.spa.fl_str_mv	Tecnología de materiales Magnetismo Propiedad eléctrica
dc.subject.unesco.eng.fl_str_mv	Materials engineering Magnetism Electrical properties
description	ilustraciones, fotografías, gráficas, tablas
publishDate	2022
dc.date.issued.none.fl_str_mv	2022-03
dc.date.accessioned.none.fl_str_mv	2023-01-27T14:10:38Z
dc.date.available.none.fl_str_mv	2023-01-27T14:10:38Z
dc.type.spa.fl_str_mv	Trabajo de grado - Doctorado
dc.type.driver.spa.fl_str_mv	info:eu-repo/semantics/doctoralThesis
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dc.type.content.spa.fl_str_mv	Text
dc.type.redcol.spa.fl_str_mv	http://purl.org/redcol/resource_type/TD
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dc.identifier.uri.none.fl_str_mv	https://repositorio.unal.edu.co/handle/unal/83161
dc.identifier.instname.spa.fl_str_mv	Universidad Nacional de Colombia
dc.identifier.reponame.spa.fl_str_mv	Repositorio Institucional Universidad Nacional de Colombia
dc.identifier.repourl.spa.fl_str_mv	https://repositorio.unal.edu.co/
url	https://repositorio.unal.edu.co/handle/unal/83161 https://repositorio.unal.edu.co/
identifier_str_mv	Universidad Nacional de Colombia Repositorio Institucional Universidad Nacional de Colombia
dc.language.iso.spa.fl_str_mv	spa
language	spa
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dc.format.extent.spa.fl_str_mv	xxv, 133 páginas
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dc.publisher.spa.fl_str_mv	Universidad Nacional de Colombia
dc.publisher.program.spa.fl_str_mv	Bogotá - Ingeniería - Doctorado en Ingeniería - Ciencia y Tecnología de Materiales
dc.publisher.faculty.spa.fl_str_mv	Facultad de Ingeniería
dc.publisher.place.spa.fl_str_mv	Bogotá, Colombia
dc.publisher.branch.spa.fl_str_mv	Universidad Nacional de Colombia - Sede Bogotá
institution	Universidad Nacional de Colombia
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spelling	Atribución-NoComercial-SinDerivadas 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Roa Rojas, Jairo07f67cd42f02e686a14bccff900b3b5f600Cardona Vásquez, Jorge Andrés5b7a98a8af166d6c9ff36461147d10a2Grupo de Física de Nuevos Materiales2023-01-27T14:10:38Z2023-01-27T14:10:38Z2022-03https://repositorio.unal.edu.co/handle/unal/83161Universidad Nacional de ColombiaRepositorio Institucional Universidad Nacional de Colombiahttps://repositorio.unal.edu.co/ilustraciones, fotografías, gráficas, tablasEl presente trabajo muestra un detallado estudio de materiales basados en manganitas de tierras raras RMnO3 (R = ion de tierras raras). En la literatura hay diversos reportes que muestran que las propiedades estructurales, magnéticas, eléctricas, y ópticas de estos materiales, dependen de la naturaleza del ion de tierras raras, así como de su tamaño. Tomando como punto de partida las manganitas de tierras raras con gadolinio (Gd) y disprosio (Dy), se realizaron sustituciones en las posiciones de los iones R y Mn para dar lugar a la familia de materiales dada por la formula genérica R2AMn3-xCoxO9, donde A un ion alcalinotérreo (Ca o Sr) y x determina el grado de sustitución de iones de cobalto (Co) en las posiciones de los iones de manganeso (Mn). Estas sustituciones buscaban fundamentalmente inducir estados de valencia mixta en los iones Mn, para generar ferromagnetismo en los materiales, de igual manera, se buscaba reforzar este comportamiento con la introducción de iones Co en las posiciones Mn. La síntesis de los materiales se realizó por medio de la técnica de reacción de estado sólido convencional, partiendo de precursores de alta pureza (>99%) disponibles comercialmente. Por medio de la técnica de difracción de rayos X se realizó el seguimiento de la evolución del proceso de síntesis. Este análisis mostró que a partir de un tratamiento térmico con temperaturas máximas de 1473 K es posible la obtención de fases de alta pureza y cristalinidad para todos los materiales estudiados. La caracterización estructural del sistema se llevó a cabo por medio del refinamiento Rietveld de los patrones de difracción medidos sobre las muestras finales, observando que todos los materiales de la familia presentan una simetría ortorrómbica con grupo espacial Pbnm (No. 62). Así mismo, el refinamiento permitió estudiar el comportamiento de los parámetros de red, distorsiones y rotaciones octaédricas del sistema, evidenciando la estabilización estructural (aumento del grado de simetría) de los materiales al aumentar el radio iónico del ion A o aumentar el grado de sustitución x, acercando la celda unitaria a la simetría tetragonal. El comportamiento magnético de los materiales fue estudiado por medio de medidas de magnetización en función de la temperatura en ciclos de enfiado a campo cero (ZFC) y de enfriamiento con campo aplicado (FC), observando un carácter paramagnético a temperatura ambiente, con transiciones de fase por debajo de 100 K a estados ferromagnético y antiferromagnético que compiten entre sí, viéndose favorecido el antiferromagnetismo por debajo de 50 K y el ferromagnetismo entre 50 K y 100 K. Finalmente, la respuesta eléctrica de los materiales fue estudiada mediante curvas de impedancia compleja en función de la temperatura en un rango de 70 K a 300 K con frecuencias aplicadas de 100 Hz, 1kHz, 10 kHz y 100 kHz, observando un comportamiento semiconductor en todo el rango de temperatura y transiciones de fase dependientes de la frecuencia asociadas con los mecanismos de transporte y relajación dieléctrica de los materiales. (Texto tomado de la fuente).This work shows a detailed study of materials based on rare earth manganites RMnO3 (R = rare earth ion). In the literature there are several reports showing that the structural, magnetic, electrical and optical properties of these materials depend on the nature of the rare earth ion, as well as its size. Taking the rare earth manganites with gadolinium (Gd) and dysprosium (Dy) as a starting point, substitutions were made in the positions of the R and Mn ions to give rise to the family of materials given by the generic formula R2AMn3-xCoxO9, where A binding alkaline earth (Ca or Sr) and x determines the degree of substitution of cobalt (Co) ions at the manganese (Mn) ion positions. These substitutions sought to induce states of mixed valence in the Mn ions, to generate ferromagnetism in the materials, additionally, they sought to reinforce this behavior with the introduction of Co ions in the Mn positions. Synthesis of the materials was carried out by the conventional solid state reaction technique, starting from commercially available high purity precursors (>99%). Through the X-ray diffraction technique, the evolution of the synthesis process was monitored. This analysis showed that from a thermal treatment with maximum temperatures of 1473 K it is possible to obtain phases of high purity and crystallinity for all materials. Structural characterization of the system was carried out through the Rietveld refinement of the diffraction patterns measured on the final samples, observing that all the materials of the family present an orthorhombic symmetry with a Pbnm space group (No. 62). Likewise, the refinement allowed studying the behavior of the lattice parameters, distortions and octahedral rotations of the system, evidencing the structural stabilization (increase in the degree of symmetry) of the materials by increasing the ionic radius of the A ion or increasing the degree of substitution. x, bringing the unit cell closer to tetragonal symmetry. The magnetic behavior of the materials was studied by means of measurements of magnetization as a function of temperature in zero field cooling (ZFC) and field cooling (FC) loops, observing a paramagnetic character at room temperature, with phase transitions below 100 K to competing ferromagnetic and antiferromagnetic states, showing that the antiferromagnetism being favored below 50 K and ferromagnetism dominates between 50 K and 100 K. Finally, the electrical response of the materials was studied using complex impedance curves as a function of temperature in a range from 70 K to 300 K with applied frequencies of 100 Hz. , 1kHz, 10kHz, and 100kHz, observing semiconductor behavior over the entire temperature range and frequency-dependent phase transitions associated with the dielectric relaxation and transport mechanisms of materials.Incluye anexosDoctoradoDoctor en IngenieríaCiencia y tecnología de materiales cerámicos y compuestosxxv, 133 páginasapplication/pdfspaUniversidad Nacional de ColombiaBogotá - Ingeniería - Doctorado en Ingeniería - Ciencia y Tecnología de MaterialesFacultad de IngenieríaBogotá, ColombiaUniversidad Nacional de Colombia - Sede Bogotá620 - Ingeniería y operaciones afines::621 - Física aplicadaManganitaPerovskitaRefinamiento RietveldSusceptibilidad magnéticaImpedancia complejaPerovskiteManganiteRietveld refinementMagnetic susceptibilityComplex impedanceTecnología de materialesMagnetismoPropiedad eléctricaMaterials engineeringMagnetismElectrical propertiesSíntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)Synthesis and characterization of the new material with triple perovskite structure R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 and 1.5)Trabajo de grado - Doctoradoinfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_db06Texthttp://purl.org/redcol/resource_type/TDW. 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Síntesis y caracterización del nuevo material con estructura perovskita triple R2AMn3-xCoxO9 (R = Gd, Dy; A = Ca, Sr; x = 0.0, 0.5, 1.0 y 1.5)

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