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 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 17
  • Publication Date: 2012
  • Doi Number: 10.1557/jmr.2012.193
  • Journal Name: JOURNAL OF MATERIALS RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2271-2277
  • Ankara Yıldırım Beyazıt University Affiliated: Yes

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.