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Efectos de intercambio y correlación en las propiedades estructurales y electrónicas del TiO2 en la fase rutilo / Exchange and correlation effects on the structural and electronic properties of TiO2 on the rutile phase

Abstract

En este trabajo, se estudiaron las propiedades estructurales y electrónicas del TiO2 en la fase rutilo a partir
de cálculos de primeros principios. Los efectos de intercambio y correlación electrónica fueron estudiados
utilizando funcionales en la aproximación de densidad local (LDA), la aproximación de gradiente generalizado
(GGA) de Perdew-Burke-Ernzerhof (PBE), Perdew-Burke-Ernzerhof revised for solids (PBEsol),
Perdew-Wang 91 (PW91) y revised Perdew-Burke-Ernzerhof (rPBE), y la aproximación de gradiente
meta-generalizado (meta-GGA) de Tao-Perdew-Staroverov-Scuseria (TPSS) y revised-TPSS (RTPSS), en el
marco de la Teoría del Funcional de la Densidad (DFT). Encontramos que el funcional PBEsol proporciona
mejores resultados para el cálculo de los parámetros de red (a y c) y las longitudes ecuatorial y axial (deq
y dax), mientras que para la energía de cohesión (Ecoh), el módulo volumétrico (B0) y los ángulos (2q y
a) los funcionales PBE, rPBE y TPSS, respectivamente, se acercan más a los valores experimentales. Se
confirma que el TiO2 presenta propiedades de semiconductor directo en G

Keywords

Cálculo de primeros principios, DFT, GGA, TiO2

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Author Biography

Rafael Gonzalez Hernandez

Dr. Rafael Gonzalez

Profesor Asociado

Departamento de Fisica

Universidad del Norte


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