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Structure and Properties of Polycrystalline TiO2-Doped with Chromium Ions Studied by EPR and Optical Methods

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Abstract

Paramagnetic centers (PCs) of Ti3+ and Cr3+ were detected in polycrystalline Cr-doped TiO2 (rutile) semiconductors in which the chromium content varied from 0.1 to 1.7 at.%. For the first time, the energy position of the Cr3+ ion in the band gap of such oxide semiconductors was determined using the electron paramagnetic resonance (EPR) technique with illumination in situ. The irradiation effect was reversible. We believe that the increase of the EPR signal intensity under illumination is a result of capturing the photoexcited charge carriers by chromium ions with their subsequent transition to the state of Cr3+ paramagnetic centers (PCs) whose energy levels are located practically in the middle of the band gap, ca. 1.45 eV below the conduction band of TiO2 semiconductor. The band gap was determined by optical experiments. Spin Hamiltonian parameters (g, D, and E values) have been obtained by EPR spectra simulation.

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Acknowledgements

The experiments were performed using the facilities of the Collective Use Center at the Moscow State University. This study was partially supported by the State assignment of Russian Federation № AAAA20-120021390044-2.

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Authors and Affiliations

  1. Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russian Federation

    E. A. Konstantinova & V. B. Zaitsev

  2. Faculty of Nano-, Bio-, Information and Cognitive Technologies, Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russian Federation

    E. A. Konstantinova

  3. N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation

    E. A. Ugolkova

  4. Physics Department, Yerevan State University, Yerevan, Republic of Armenia

    V. M. Aroutyunian

  5. N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Moscow, Russian Federation

    A. I. Kokorin

  6. Plekhanov Russian University of Economics, Moscow, Russian Federation

    A. I. Kokorin

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  1. E. A. Konstantinova
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  3. V. B. Zaitsev
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  4. V. M. Aroutyunian
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Correspondence to E. A. Konstantinova.

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Konstantinova, E.A., Ugolkova, E.A., Zaitsev, V.B. et al. Structure and Properties of Polycrystalline TiO2-Doped with Chromium Ions Studied by EPR and Optical Methods. Appl Magn Reson 53, 717–730 (2022). https://doi.org/10.1007/s00723-021-01396-1

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  • DOI: https://doi.org/10.1007/s00723-021-01396-1

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