The Meyer-Neldel rule in amorphous TiO2 films with different Fe content

Mardare D., YILDIZ A. , Apetrei R., Rambu P., Florea D., Gheorghe N. G. , ...More

JOURNAL OF MATERIALS RESEARCH, vol.27, no.17, pp.2271-2277, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 17
  • Publication Date: 2012
  • Doi Number: 10.1557/jmr.2012.193
  • Title of Journal : JOURNAL OF MATERIALS RESEARCH
  • Page Numbers: pp.2271-2277

Abstract

Amorphous titania thin films with increasing Fe content have been prepared by RF magnetron sputtering. X-ray absorption spectroscopy revealed modifications of both local structures/environment of the Ti and Fe atoms, with formation of phases containing amorphous material and a magnetite-like phase. The temperature dependence of the electrical conductivity of the films was investigated for temperatures higher than half of the Debye temperature (T > 391 K). It was found that the electrical conductivity in the amorphous Fe/TiO2 films obeys the Meyer-Neldel rule. The origin of this behavior is explained on the basis of the multiphonon-assisted hopping model.