Improved room temperature dielectric properties of Gd3+ and Nb5+ co-doped Barium Titanate ceramics

Batoo, Khalid Mujasam and Verma, Ritesh and Chauhan, Ankush and Kumar, Rajesh and Hadi, Muhammad and Aldossary, Omar M. and Al-Douri, Yarub (2021) Improved room temperature dielectric properties of Gd3+ and Nb5+ co-doped Barium Titanate ceramics. Journal of Alloys and Compounds, 883. ISSN 0925-8388, DOI

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In this paper, we report the synthesis of gadolinium (Gd) and niobium (Nb) co-doped barium titanate (BT) ceramic oxides prepared using a conventional solid-state reaction method. The X-ray diffraction pattern confirmed the formation of tetragonal phase - with the space group P4mm - in all samples. X-ray photoelectron spectroscopy shows the formation of oxygen vacancies with a variable concentration that depends on the site preference of Gd ions. Fourier - Transform infrared analysis shows the presence of the most prominent peak between 544 cm(-1) and 588 cm(-1). Raman spectroscopy shows the tetragonal phase, with a most prominent peak around 514 cm(-1) due to A1(TO3)E(TO4) mode. Shifting of this peak suggests the formation of Gd-Ba defects. UV measurement suggests an increase in bandgap from 2.928 eV to 3.047 eV with Gd doping. Photoluminescence shows the presence of multiple level emission mechanisms for all samples. The dielectric constant increases while dielectric loss decreased with increasing dopant concentration, which is attributed to the self-compensation mechanism and defect dipole formation. Impedance spectra, Z'andZ''vs frequency, suggest the presence of space charge polarization. Modulus spectra, M'andM''vs frequency indicates the presence of short-range mobility at low frequency and long-range mobility at high frequency. AC conductivity shows almost negligible change with variable dopants concentration. Thus, electrical properties were observed to improve with Gd and Nb co-doping on BT ceramic oxides. (C) 2021 Elsevier B.V. All rights reserved.

Item Type: Article
Funders: Deanship of Scientific Research at King Saud University, Riyadh, Saudi Arabia
Uncontrolled Keywords: X-ray diffraction; X-ray photoelectron spectroscopy; Dielectric constant; Impedance
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Nanotechnology & Catalysis Research Centre
Depositing User: Ms Zaharah Ramly
Date Deposited: 22 Aug 2022 06:09
Last Modified: 22 Aug 2022 06:09

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