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Studies of Structural, Microstructure, Dielectric and Optical Properties of Bismuth-Based Complex Perovskite Modified Bismuth Ferrite: BiFeO3–(Bi0.5Na0.25K0.25)(Ti0.5Mn0.5)O3 Ceramics

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Abstract

This communication describes a solid-state reaction prepared bismuth oxide and related complex compounds (BNKMT) of a chemical composition (1 − x)BiFeO3 − x(Bi0.5Na0.25K0.25Ti0.5Mn0.5O3), where x = 0.15 and 0.20. Structural studies of the complex system show rhombohedral crystal symmetry (#R3c). The homogeneous distribution of the grains and grain boundaries throughout the sample surface clearly defined grain boundaries, which play a significant part in the conductivity mechanism, as revealed by the analysis of scanning electron microscopy micrographs and electrical properties. An energy-dispersive X-ray analysis spectrum was used to verify the processed materials’ purity and composition. According to the analysis of the FTIR-ATR spectrum, the prepared samples show stretching bands that correspond to their constituent elements. A dielectric investigation confirmed that the Maxwell–Wanger type of dielectric dispersion is present in the samples. Studies of impedance parameters as a function of temperature and frequency result in a negative temperature coefficient of resistance behavior. While ac conductivity research supports the presence of a thermally activated relaxation process in the materials. Analysis of electric modulus discloses a non-Debye type relaxation mechanism in the studied sample. Because the samples are semiconducting at high temperatures, semi-circular arcs have been seen in both the Nyquist and Cole–Cole plots. When compared to BNKTM 15%, BNKTM 20% has a bandgap energy of 5.9 eV, according to the analysis of UV visible spectra.

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Acknowledgements

The authors would like to extend their gratitude and sincere thanks to Siksha O Anusandhan (Deemed to be University), Bhubaneswar for providing experimental facilities. We would like to thank Bandana, Preeti, and Sagarika for their support and encouragement.

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Correspondence to Umakant Prasad.

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Sourav, S.K., Parida, S.K., Choudhary, R.N.P. et al. Studies of Structural, Microstructure, Dielectric and Optical Properties of Bismuth-Based Complex Perovskite Modified Bismuth Ferrite: BiFeO3–(Bi0.5Na0.25K0.25)(Ti0.5Mn0.5)O3 Ceramics. Trans. Electr. Electron. Mater. 24, 434–446 (2023). https://doi.org/10.1007/s42341-023-00462-8

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