Detailed atomistic investigation of Fe-doped rutile phases

Wenqing Li, Agnieszka Kuc, Christian F.J. Walther, Thomas Heine

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We have investigated iron-doped rutile TiO2 in great detail by density functional theory (DFT) calculations. The influence of the Fe dopants on the structural and electronic properties are calculated. Three different dopant models are considered in this study, where iron is present in Fe(II), Fe(III), and Fe(IV) oxidation states. Our results indicate that the configuration of Fe(III), where two neighboring Ti sites are replaced by Fe dopants and an O vacancy locates in between, is the lowest-energy structure. The resulting Mößbauer signatures are in excellent agreement with the available experimental literature data, thus supporting the proposed structural model. Although the crystal structure of doped rutile is not significantly altered, even for larger concentrations of dopant atoms, the local structure around Fe atoms can be strongly distorted, especially due to the presence of oxygen vacancies. Fe doping lowers the band gap and introduces midgap states.

Original languageEnglish
Pages (from-to)5742-5748
Number of pages7
JournalJournal of Physical Chemistry A
Volume119
Issue number22
DOIs
Publication statusPublished - 2015 Jun 4

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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