Magnéli-like phases in epitaxial anatase TiO2 thin films

Abstract

Using high-resolution transmission electron microscopy and image simulation techniques in combinationwith ab initio calculations, we show the existence of two different superlattices of crystallographic shearplanes, analogous to the Magnéli phases of rutile, in oxygen-deficient films of anatase TiO2 epitaxiallygrown on LaAlO3 substrates. (103)- and (101)-oriented shear plane structures are detected in the outer filmregion and in proximity of the film/substrate interface, respectively. We show that these shear planes arecharacterized by TiO-like cubic local structures, which can deviate from the TinO2n-1 stoichiometry of theclassical rutile-derived Magnéli phases, particularly in the outer part of the film. Computed formation energiesprovide insights into the thermodynamic stability of the observed structures and their relations to the growthdynamics.


Autore Pugliese

Tutti gli autori

  • Ciancio R.; Carlino E.; Rossi G.; Aruta C.; Scotti Di Uccio U.; Vittadini A.; Selloni A.

Titolo volume/Rivista

Physical review. B, Condensed matter and materials physics


Anno di pubblicazione

2012

ISSN

1098-0121

ISBN

Non Disponibile


Numero di citazioni Wos

Nessuna citazione

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Settori ERC

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Codici ASJC

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