Dielectric relaxation and conduction mechanism in Aurivillius ceramic Bi5Ti3FeO15

Rasmita Jena; K. Chandrakanta; P. Pal; Md. F. Abdullah; S. D. Kaushik; A.K. Singh

doi:10.1007/s12613-020-2091-3

Volume 28 Issue 6

Jun. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(6): 1063-1071

Rasmita Jena, K. Chandrakanta, P. Pal, Md. F. Abdullah, S. D. Kaushik, and A.K. Singh, Dielectric relaxation and conduction mechanism in Aurivillius ceramic Bi₅Ti₃FeO₁₅, Int. J. Miner. Metall. Mater., 28(2021), No. 6, pp. 1063-1071. https://doi.org/10.1007/s12613-020-2091-3

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Rasmita Jena, K. Chandrakanta, P. Pal, Md. F. Abdullah, S. D. Kaushik, and A.K. Singh, Dielectric relaxation and conduction mechanism in Aurivillius ceramic Bi5Ti3FeO15, Int. J. Miner. Metall. Mater., 28(2021), No. 6, pp. 1063-1071. https://doi.org/10.1007/s12613-020-2091-3

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Research Article

Dielectric relaxation and conduction mechanism in Aurivillius ceramic Bi₅Ti₃FeO₁₅

+ Author Affiliations

Corresponding author:
A.K. Singh E-mail: singhanil@nitrkl.ac.in
Received: 11 January 2020; Revised: 23 April 2020; Accepted: 7 May 2020; Available online: 9 May 2020

Abstract

Abstract

For this study, we synthesized Aurivillius Bi₅Ti₃FeO₁₅ ceramic using the generic solid-state reaction route and then performed room-temperature X-ray diffraction to confirm that the compound had a single phase with no impurities. The surface morphology of the prepared sample was observed to contain microstructural grains approximately 0.2–2 μm in size. The dielectric properties of the sample were determined as a function of frequency in a range of approximately 100 Hz to 1 MHz at various temperatures (303 K ≤ T ≤ 773 K). Nyquist plots of the impedance data were found to exhibit a semi-circular arc in the high-temperature region, which is explained by the equivalent electrical circuit (R₁C₁)(R₂QC₂), where R₁ and R₂ represent the resistances associated with the grains and grain boundaries, respectively, C₁ and C₂ are the respective capacitances, and Q is the constant phase element (CPE), which accounts for non-Debye type of behavior. Our results indicate that both the resistance and capacitance of the grain boundaries are more prominent than those of the grains. The alternating current (ac) conductivity data were analyzed based on the Jonscher universal power law, which indicated that the conduction process is dominated by the hopping mechanism. The calculated activation energies of the relaxation and conduction processes were very similar (0.32 to 0.53 eV), from which we conclude that the same type of charge carriers are involved in both processes.
- Nyquist plot;
- impedance spectroscopy;
- activation energy;
- ac conductivity;
- hopping

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