Magnetism and EPR Spectroscopy of Nanocrystalline and Amorphous TiO2: Fe upon Al Doping
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
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Magnetism and EPR Spectroscopy of Nanocrystalline and Amorphous TiO2: Fe upon Al Doping
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| Автор |
Yermakov, A.
Uimin, M. Borodin, K. Minin, A. Boukhvalov, D. Starichenko, D. Volegov, A. Eremina, R. Yatsyk, I. Zakharova, G. Gaviko, V. |
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| Тематика |
AMORPHOUS STATE
DFT CALCULATION EPR FE AND AL LOCALIZATION MAGNETISM NANOCRYSTALLINE STATE TIO2:FE DOPED BY AL |
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| Описание |
This work is devoted to the study of the magnetic properties and Electron Paramagnetic Resonance (EPR) spectroscopy of TiO2:Fe nanoparticles doped with Al in different structural states. The sol-gel methods have been used to obtain the particles in both crystalline (average size from 3 to 20 nm) and X-ray amorphous states. The electron paramagnetic resonance spectra of crystalline samples TiO2:Fe doped with aluminum besides a resonance line with g-factor ~2 exhibit a small signal with a g-factor of 4.3 from Fe3+ ions with rhombohedral distortions. The fraction of Fe3+ with rhombohedral distortions increases with increasing aluminum content. For the amorphous state at Al doping, the resonance with a g-factor of 4.3 is completely dominant in the electron paramagnetic resonance spectrum. The density functional theory calculation shows that aluminum prefers to be localized near iron ions, distorting the nearest Fe3+ environment. The complex integral electron paramagnetic resonance spectrum of all samples was fitted with sufficient accuracy by three separate resonance lines with different widths and intensities. The temperature behavior of the electron paramagnetic resonance spectrum can be described by the coexistence of paramagnetic centers (isolated Fe3+ ions including dipole-dipole interactions) and iron clusters with negative exchange interactions. © 2023 by the authors.
Russian Foundation for Basic Research, РФФИ: 20-02-00095; Russian Academy of Sciences, РАН; Ministry of Education and Science of the Russian Federation, Minobrnauka: 122021000034-9 This work is financially supported by the RFBR Grant #20-02-00095 and partly by the Ministry of Science and Higher Education of the Russian Federation (theme “Magnet”, project No. 122021000034-9). Electron spin resonance measurements (Rushana Eremina, Ivan Yatsyk) were performed with the financial support from the government assignment for FRC Kazan Scientific Center of RAS. |
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| Дата |
2024-04-05T16:37:02Z
2024-04-05T16:37:02Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Yermakov, A, Uimin, M, Borodin, K, Minin, A, Boukhvalov, D, Starichenko, D, Volegov, A, Eremina, R, Yatsyk, I, Zakharova, G & Gaviko, V 2023, 'Magnetism and EPR Spectroscopy of Nanocrystalline and Amorphous TiO2: Fe upon Al Doping', Magnetochemistry, Том. 9, № 1, 26. https://doi.org/10.3390/magnetochemistry9010026
Yermakov, A., Uimin, M., Borodin, K., Minin, A., Boukhvalov, D., Starichenko, D., Volegov, A., Eremina, R., Yatsyk, I., Zakharova, G., & Gaviko, V. (2023). Magnetism and EPR Spectroscopy of Nanocrystalline and Amorphous TiO2: Fe upon Al Doping. Magnetochemistry, 9(1), [26]. https://doi.org/10.3390/magnetochemistry9010026 2312-7481 Final All Open Access, Gold https://www.scopus.com/inward/record.uri?eid=2-s2.0-85146772903&doi=10.3390%2fmagnetochemistry9010026&partnerID=40&md5=02b5c0690b451c4429dcd41089834978 https://www.mdpi.com/2312-7481/9/1/26/pdf?version=1673257246 http://elar.urfu.ru/handle/10995/131003 10.3390/magnetochemistry9010026 85146772903 000915135500001 |
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| Язык |
en
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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| Формат |
application/pdf
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MDPI
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| Источник |
Magnetochemistry
Magnetochemistry |
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