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Impact of hydrogenation on the structural, optical and dielectric properties of (Sb + Dy) co-doped TiO$_2$ nanoparticles
Volume 46 Published: 12 May 2023 Article ID 0099
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Fulltext
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Permanent link:
https://www.ias.ac.in/article/fulltext/boms/046/0099 -
Keywords
Sb/Dy co-doped TiO$_2$ ;colossal permittivity ;electroceramic ;hydrogenation of ceramics. -
Abstract
TiO$_2$ oxide nanoparticles co-doped with Sb/Dy ions were synthesized by a hydrothermal precipitation method. Some amount of the synthesized co-doped sample was hydrogenated at ${\sim}$550°C for 30 min. The samples were characterized by traditional methods: structural investigation by X-rays, an optical investigation by spectral diffuse reflectance and AC dielectric measurements. It was noticed that 3%-Sb/Dy co-doping induces growth of mixed (Anatase + rutile) TiO$_2$ phases. The different styles of doping of Sb$6{5+}$ and Dy$^{3+}$ ions into TiO$_2$ nanocrystallites can be utilized to produce core/shell construction for the creation of colossal permittivity (CP). Thus, the dielectric permittivity for Sb/Dy co-doped TiO$_2$ was found to be of order ${\sim}$10$^3$ at 1 kHz. The hydrogenation was found to reduce the CP by influencing the core/shell constructions as well as by the creation of a high density of itinerant electrons, which could be estimated by the optical measurements. This result is important from point of view of studying the influence of hydrogenation on the dielectric properties of nano-sized transparent conducting oxides. The created CP was explained, in the present work, within the framework of the core/shell model and doping mechanisms. Such important results will be useful for future work on using hydrogenation to support/reduce CP depending on the types of dopant ions.
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Author Affiliations
- Department of Physics, College of Science, University of Bahrain, P.O. Box 32038, Zallaq, Kingdom of Bahrain
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Dates
- Published
- 12 May 2023
- Manuscript received
- 4 September 2022
- Accepted
- 11 January 2023
- Final version published online
- 12 May 2023
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Bulletin of Materials Science
Volume 46, 2023
All articles
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Dr Shanti Swarup Bhatnagar for Science and Technology
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