Abstract
The present study reports the synthesis (mixed oxide reaction route) and characterization (structural, dielectric and impedance spectroscopic) behaviour of cerium-modified bismuth samarium titanate (Bi3SmTi3O12) compounds. The room temperature X-ray diffractogram suggests orthorhombic symmetry. Micro-structures of the samples with cerium incorporation exhibit typical lamellar structures and overlapped grain boundaries with grain sizes in the range of 0.7–1.15 µm. Dielectric anomalies pertaining to heterogeneous electrical relaxations, Maxwell–Wagner polarization effects and phase transition are also discussed. The compound’s ac electrical conductivity response’s disagreement to universal Jonscher power law is understood from the jump relaxation and concept of mismatch and relaxation models. Reduction in activation energy values with increase in frequency also confirms decrease in barrier height. The potential for thermistor applications and the negative temperature coefficient of resistance behaviour of the sample is critically examined from impedance and temperature resistance study. Optical band-gap studies reveal a reduction in energy band gap from 2.91 to 2.29 eV. Further, the Nyquist plot of the compounds also corroborates the non-Debye nature of relaxation in the samples.
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The data sets supporting the results reported in the manuscript can be available from the corresponding author on reasonable request.
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One of the authors Rashmi Rekha Sahoo would like to acknowledge DST, INSPIRE for the financial support.
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All authors contributed to the study conception and design. Material preparation, data collection was done by Rashmi Rekha Sahoo and analysis were performed by Rashmi Rekha Sahoo and R.N.P Choudhary. The first draft of the manuscript was written by Rashmi Rekha Sahoo and R.N.P Choudhary all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Sahoo, R.R., Choudhary, R.N.P. Investigation of structural, dielectric, transport and optical characteristics of Sm/Ce modified bismuth titanate ceramics. J Mater Sci: Mater Electron 35, 737 (2024). https://doi.org/10.1007/s10854-024-12429-3
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DOI: https://doi.org/10.1007/s10854-024-12429-3