Miniatura

Fitxers

667301.pdf (1.23 MB)

Tipus de document

Article

Versió

Versió acceptada

Data de publicació

2016-04-01

Tots els drets reservats

Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/114911

Performance of a modified hybrid functional in the simultaneous description of stoichiometric and reduced TiO2 polymorphs

Títol de la revista

Autors

Director/Tutor

ISSN de la revista

Títol del volum

Recurs relacionat

https://doi.org/10.1039/C6CP00912C

Resum

Conventional density functionals with either the local density approximation (LDA) or the generalized gradient approximation (GGA) form of the exchange-correlation potential fail to describe the electronic structure of a large number of metal oxides. Both the LDA and the GGA grossly underestimate the band gaps of these materials which severely affect the description of oxygen vacancy point defect states in reduced samples. To find a pragmatic approach to simultaneously and accurately describe the atomic and electronic structures of the most common TiO2 polymorphs, we explore the effect of the percentage of exact, non-local, Fock exchange on the electronic structure of stoichiometric rutile and anatase. From these results, a modified hybrid functional is proposed to properly describe the atomic structures, formation enthalpies and electronic structures of rutile and anatase and, at the same time, the results of reduced samples are also in good agreement with the available experimental results. The present approach can be safely used to accurately describe numerous TiO2 based materials containing defects or realistic nanoparticles for which the required large unit cells or system sizes hinder the use of GW related techniques.

Matèries

Diòxid de titani, Teoria del funcional de densitat, Teoria de l'aproximació

Matèries (anglès)

Titanium dioxide, Density functionals, Approximation theory

Citació

Col·leccions

Articles publicats en revistes (Ciència dels Materials i Química Física)

Citació

KO, Kyoung chul, LAMIEL GARCIA, Josep oriol, LEE, Jin yong, ILLAS I RIERA, Francesc. Performance of a modified hybrid functional in the simultaneous description of stoichiometric and reduced TiO2 polymorphs. _Physical Chemistry Chemical Physics_. 2016. Vol. 17, núm. 2016, pàgs. 12357-12367. [consulta: 23 de gener de 2026]. ISSN: 1463-9076. [Disponible a: https://hdl.handle.net/2445/114911]

Exportar metadades

JSON - METS

Compartir registre