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

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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.

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Acknowledgments

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

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Authors and Affiliations

  1. Solar Energy Technologies, School of Computing, Engineering and Mathematics, University of Western Sydney, Penrith, NSW, 2751, Australia

    U. Jayamaha, T. Bak, J. Nowotny & R. Liu

  2. Institute of Environmental Research, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirawee, DC, NSW, 2232, Australia

    A. J. Atanacio

Authors
  1. U. Jayamaha
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  2. A. J. Atanacio
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  3. T. Bak
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  4. J. Nowotny
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  5. R. Liu
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Correspondence to J. Nowotny.

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Jayamaha, U., Atanacio, A.J., Bak, T. et al. Effect of oxygen activity on chromium segregation in Cr-doped TiO2 single crystal. Ionics 21, 785–790 (2015). https://doi.org/10.1007/s11581-014-1226-9

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  • DOI: https://doi.org/10.1007/s11581-014-1226-9

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