Publicación:
Nuevas aleaciones ternarias 2D basadas en dióxidos de metales de transición

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dc.contributor.advisorOrtega López, Cesarspa
dc.contributor.advisorMurillo García, Jean Fredspa
dc.contributor.authorHumánez Tobar, Ángelspa
dc.coverage.spatialMontería, Córdobaspa
dc.date.accessioned2020-10-20T21:28:51Zspa
dc.date.available2020-10-20T21:28:51Zspa
dc.date.issued2020-06-21spa
dc.description.abstractSe estudian las propiedades estructurales, electrónicas y la estabilidad energética de los dióxidos VO2, CrO2, MoO2 y WO2 en la fase estructural 2H en volumen y de las monocapas ternarias basadas en dióxidos de metales de transición MTxV1-xO2 (con MT=Cr, Mo y W; x= 0, 0.25, 0.50, 0.75 y 1) en estructura H, mediante la Teoría del Funcional de la Densidad (Density Functional Theory: DFT) usando pseudopotenciales ultrasuaves y una base de ondas planas como se implementa en el paquete Quantum-ESPRESSO. Para la interacción electrón-electrón se usó la aproximación de Gradiente Generalizado (GGA) de Perdew-Burke-Ernzerhof (PBE). Se determina, que tanto los sistemas volumétricos como las aleaciones bidimensionales son energéticamente estables, siendo los volumétricos más estables que sus monocapas correspondientes, como era de esperarse. A través de la densidad de estados y el diagrama de bandas electrónicas, se establece que: a) la monocapa original o pura (prístina) VO2 es metálica y magnética, mientras que las monocapas originales CrO2, MoO2 y WO2 son semiconductoras y no magnéticas; b) Las aleaciones Mo0.25V0.75O2 y W0.25V0.75O2 son metálicas y magnéticas, mientras que la aleación Cr0.25V0.75O2 es semimetálico (half-metallic) y magnética. Esta magnetización débil, con valores de 0.08µB/átomo, 0.03 µB/átomo, y 0.09 µB/átomo para el Cr0.25V0.75O2, el Mo0.25V0.75O2 y el W0.25V0.75O2 respectivamente, se debe principalmente a la hibridación de los orbitales p-O y d-V (o más preciso, a la interacción de intercambio entre los momentos magnéticos atómicos vecinos para alinearse paralelamente entre sí: ferromagnetismo) en las aleaciones precitadas, respectivamente. Las aleaciones con concentraciones x=0.50 y 0.75 muestran magnetización nula, debido a la compensación de los orbitales arriba (up) y abajo (down) para condiciones ricas en Cr, Mo, W y moderadas en V. El comportamiento metálico de las aleaciones, es causado, principalmente, por los orbitales p del Oxígeno (p-O), y por el orbital d del vanadio, cromo, molibdeno y tungsteno, es decir, d-V, d-Cr, d-Mo y d-W, en cada aleación respectiva.spa
dc.description.degreelevelPosgradospa
dc.description.degreenameMagíster en Ciencias Físicasspa
dc.description.tableofcontentsResumen ...............................................................................................................................................9spa
dc.description.tableofcontents1. Introducción ...............................................................................................................................10spa
dc.description.tableofcontents2. Antecedentes ..............................................................................................................................11spa
dc.description.tableofcontents3. Justificación ...............................................................................................................................13spa
dc.description.tableofcontents4. Planteamiento del problema .......................................................................................................15spa
dc.description.tableofcontents5. Objetivos ....................................................................................................................................16spa
dc.description.tableofcontents5.1. Objetivo general .................................................................................................................16spa
dc.description.tableofcontents5.2. Objetivos específicos .........................................................................................................16spa
dc.description.tableofcontents6. Referente teórico ........................................................................................................................17spa
dc.description.tableofcontents6.1. Hamiltoniano del problema ................................................................................................17spa
dc.description.tableofcontents6.2. Teoría del funcional de la densidad (DFT) ........................................................................18spa
dc.description.tableofcontents6.2.1. Aproximación de densidad local (LDA) ..........................................................................19spa
dc.description.tableofcontents6.2.2. Aproximación de gradiente generalizado (GGA) ............................................................19spa
dc.description.tableofcontents6.3. Pseudopotenciales y Ondas Planas ....................................................................................20spa
dc.description.tableofcontents6.3.1. Pseudopotenciales que conservan la norma .....................................................................20spa
dc.description.tableofcontents6.3.2. Pseudopotenciales ultrasuaves .........................................................................................20spa
dc.description.tableofcontents6.4. Ciclo de autoconsistencia ...................................................................................................21spa
dc.description.tableofcontents7. Metodología ...............................................................................................................................23spa
dc.description.tableofcontents8. Análisis de los resultados ...........................................................................................................25spa
dc.description.tableofcontents8.1. Dióxidos VO2, CrO2, MoO2 y WO2 en el volumen ............................................................25spa
dc.description.tableofcontents8.1.1. Resultados estructurales y estabilidad energética en el volumen .....................................26spa
dc.description.tableofcontents8.1.2. Carácter electrónico en el volumen ..................................................................................29spa
dc.description.tableofcontents8.2. Monocapas prístinas VO2, CrO2, MoO2 y WO2 ................................................................33spa
dc.description.tableofcontents8.2.1. Resultados estructurales y estabilidad energética monocapas prístinas ...........................34spa
dc.description.tableofcontents8.2.2. Carácter electrónico de las monocapas prístinas ..............................................................36spa
dc.description.tableofcontents8.3. Aleaciones 2D MTxV1-xO2 con MT: Cr, Mo y W; x: 0.25, 0.50 y 0.75 ............................38spa
dc.description.tableofcontents8.3.1. Resultados estructurales de las aleaciones .......................................................................38spa
dc.description.tableofcontents8.3.2. Carácter electrónico de las aleaciones..............................................................................44spa
dc.description.tableofcontents9. Conclusiones ..............................................................................................................................53spa
dc.description.tableofcontentsAnexos ...............................................................................................................................................55spa
dc.description.tableofcontentsAnexo A: Los grupos espaciales considerados ..............................................................................55spa
dc.description.tableofcontentsA1. Grupo espacial P-6m2 (#187) .............................................................................................55spa
dc.description.tableofcontentsA2. Grupo espacial P63/mmc (#194) .........................................................................................55spa
dc.description.tableofcontentsAnexo B: Optimizaciones ..............................................................................................................56spa
dc.description.tableofcontentsAnexo C: Archivos de entrada .......................................................................................................59spa
dc.description.tableofcontentsReferencias bibliográficas ..................................................................................................................71spa
dc.format.mimetypeapplication/pdfspa
dc.identifier.urihttps://repositorio.unicordoba.edu.co/handle/ucordoba/3454spa
dc.language.isospaspa
dc.publisherFinanciado parcialmente por el grupo GAMASCO de la Universidad de Córdobaspa
dc.publisher.facultyFacultad de Ciencias Básicasspa
dc.publisher.programMaestría en Ciencias Físicasspa
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dc.rightsCopyright Universidad de Córdoba, 2020spa
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dc.rights.creativecommonsAtribución-NoComercial 4.0 Internacional (CC BY-NC 4.0)spa
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/spa
dc.subject.keywordsAlloyseng
dc.subject.keywordsMonolayerseng
dc.subject.keywordsElectronic propertieseng
dc.subject.keywordsEnergy stabilityeng
dc.subject.keywordsDFTeng
dc.subject.proposalAleacionesspa
dc.subject.proposalMonocapasspa
dc.subject.proposalPropiedades electrónicasspa
dc.subject.proposalEstabilidad energéticaspa
dc.subject.proposalDFTspa
dc.titleNuevas aleaciones ternarias 2D basadas en dióxidos de metales de transiciónspa
dc.typeTrabajo de grado - Pregradospa
dc.type.coarhttp://purl.org/coar/resource_type/c_7a1fspa
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Nombre:
license.txt
Tamaño:
14.48 KB
Formato:
Item-specific license agreed upon to submission
Descripción:
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B.H.A. Tesis