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Optical Properties of a Nanocrystalline Co-Doped TiO2 after Various Treatments

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Abstract

The absorption spectra of cobalt-doped anatase TiO2 nanopowders in the infrared and visible ranges have been studied after various oxidative and reductive treatments. The annealing leads to the appearance of the Drude-like contribution in the infrared region and significant change in the absorption in an visible range due to the formation of defects of the oxygen-vacancy-type and Ti3+ ions. The observed additional contribution in the absorption spectra of TiO2:Co nanopowders as compared to the spectra of undoped powders is ascribed to the d–d transitions in ions Co2+. The change in the absorption related to cobalt after annealing is explained by a change in the local environment of Co ions from the octahedral to the tetrahedral environment.

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ACKNOWLEDGMENTS

The authors are grateful to G.S. Zakharova for the synthesis of the nanopowders.

Funding

This work was carried out within the state assignment of Minobrnauki of Russia (theme Spin, no. AAAA-A18-118020290104-2) and supported in part by the program of the Ural Branch of RAS (project 18-10-2-37).

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Yekaterinburg, Russia

    E. V. Mostovshchikova, A. Ye. Yermakov, M. A. Uimin & A. S. Minin

  2. Ural Federal University Named after the First President of the Russia B. N. Yeltsin, 620002, Yekaterinburg, Russia

    A. Ye. Yermakov, M. A. Uimin & A. S. Minin

Authors
  1. E. V. Mostovshchikova
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  2. A. Ye. Yermakov
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  3. M. A. Uimin
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  4. A. S. Minin
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Corresponding author

Correspondence to E. V. Mostovshchikova.

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Translated by Yu. Ryzhkov

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Mostovshchikova, E.V., Yermakov, A.Y., Uimin, M.A. et al. Optical Properties of a Nanocrystalline Co-Doped TiO2 after Various Treatments. Phys. Solid State 61, 901–907 (2019). https://doi.org/10.1134/S1063783419050202

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  • DOI: https://doi.org/10.1134/S1063783419050202

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