Structure and Properties of Polycrystalline TiO2-Doped with Chromium Ions Studied by EPR and Optical Methods
| العنوان: | Structure and Properties of Polycrystalline TiO2-Doped with Chromium Ions Studied by EPR and Optical Methods |
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| المؤلفون: | Elizaveta A. Konstantinova, E. A. Ugolkova, A. I. Kokorin, V. B. Zaitsev, V. M. Aroutyunian |
| المصدر: | Applied Magnetic Resonance. 53:717-730 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Materials science, Solid-state physics, Band gap, business.industry, Doping, Analytical chemistry, chemistry.chemical_element, Atomic and Molecular Physics, and Optics, law.invention, Chromium, Paramagnetism, Semiconductor, chemistry, law, Charge carrier, business, Electron paramagnetic resonance |
| الوصف: | 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. |
| تدمد: | 1613-7507 0937-9347 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::9b12f062377b82ce92442d72508297aa https://doi.org/10.1007/s00723-021-01396-1 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........9b12f062377b82ce92442d72508297aa |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 16137507 09379347 |
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