Dielectric response of Cr ̵ doped TiO_2 nanoparticles: Effect of doping concentration and annealing temperature | ||||
| ERJ. Engineering Research Journal | ||||
| Article 14, Volume 44, Issue 4, October 2021, Page 465-472 PDF (954.39 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2021.91541.1109 | ||||
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| Authors | ||||
Ibrahim Eldafatry  1; Ragab elsad2; Shehab Mansour3; Elsayed Mohamed Farag4
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| 1Basic Engineering Science,Faculty of Engineering,Menoufia University,Shebin Elkom, Egypt | ||||
| 2Basic Engineering Science Department, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt | ||||
| 3Basic Engineering science, faculty of engineering, menoufia university | ||||
| 4Head Basic Engineering Science/ Faculty of Engineering/ Menoufia University. | ||||
| Abstract | ||||
| The combined effect of doping chromium (Cr) as well as annealing temperature on the dielectric spectroscopy performance of titanium (TiO_2)was investigated. Accordingly, two series of chromium doped titania samples with the form 〖(Ti〗_(1-x) Cr_x O_2) where x=0-25 mol% were fabricated utilizing the hydrolysis method. The first series was used as-synthesized while the second series was used after annealing at 500 ℃ for 1h . The microstructure of both synthesized series was characterized by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). The (XRD) result confirms the formation of the amorphous characteristics of such pure and Cr ̵ doped TiO_2 (as-synthesized) and crystaline characteristics of such pure and Cr ̵ doped TiO_2 (annealed at 500 ℃ for 1h ). The average crystallite size in second series (annealed at 500 ℃) as estimated by the Scherrer’s equation varies in the range of ~12–30 nm on doping of Cr ions in TiO_2. The measured surface area of TiO_2 is decreased by Cr doping in first series (as-synthesized) while it is increased by Cr doping in second series (annealed at 500 ℃). The variation in both dielectric constant (ε^'), and ac conductivity (σ_ac) as a function of applied frequency at different doping concentration of Cr were investigated. The measurements confirms that both ε^' and σ_ac values of TiO_2 were decreased with Cr doping in first series and increased with Cr doping in second series. | ||||
| Keywords | ||||
| TiO_2; Dielectric constant; Ac conductivity; Cr doping; Hydrothermal method | ||||
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