Ionics

, Volume 21, Issue 3, pp 785–790 | Cite as

Effect of oxygen activity on chromium segregation in Cr-doped TiO2 single crystal

  • U. Jayamaha
  • A. J. Atanacio
  • T. Bak
  • J. Nowotny
  • R. Liu
Original Paper
First Online:
Received:
Revised:
Accepted:

Abstract

The present work determined the effect of chromium segregation on surface and near-surface composition of Cr-doped TiO2 (0.05 at.% Cr) after annealing in oxidising and strongly reducing environments at 1,073 and 1,273 K. The segregation-induced depth profiles were determined by secondary ion mass spectrometry (SIMS). It was observed that annealing in oxidising conditions [p(O2) = 105 Pa] and reducing conditions [10−11 Pa > p(O2) > 10−15 Pa] results in an enrichment and depletion of the surface layer in chromium, respectively. The observed effects may be used for tailoring the surface and near-surface composition in order to impose desired properties.

Keywords

Cr-doped TiO2 Oxygen activity Surface segregation 
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Notes

Acknowledgments

The assistance of Dr. David Nelson in performing the SIMS chemical analysis is sincerely appreciated.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • U. Jayamaha
    • 1
  • A. J. Atanacio
    • 2
  • T. Bak
    • 1
  • J. Nowotny
    • 1
  • R. Liu
    • 1
  1. 1.Solar Energy Technologies, School of Computing, Engineering and MathematicsUniversity of Western SydneyPenrithAustralia
  2. 2.Institute of Environmental ResearchAustralian Nuclear Science and Technology OrganisationKiraweeAustralia

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