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Effect of Lanthanum on Structural, Dielectric, Electrical, and Optical Properties of the Bismuth Ferrite

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Abstract

In this communication, synthesis (solid-state reaction) and characterization of the Bi1-xLaxFeO3 (x = 0.03, 0.06, and 0.1) ceramics by a conventional solid-state reaction method were reported. The structural analysis of the samples predicts a rhombohedral crystal symmetry with the average crystallite size of 25–40 nm. The analysis of scanning electron microscope (SEM) micrographs suggests that grains are uniformly distributed in all the samples with well-defined grain boundaries. The analysis of the energy-dispersive X-ray analysis (EDX) spectra confirms the presence of Bi, La, Fe, and O in both weight and atomic percentage. The incorporation of the lanthanum in the Bi site of the host bismuth ferrite is confirmed by Raman’s study. Tauc’s plots provide bandgap energies of 3.09 eV, 3.11 V, and 3.17 eV corresponding to x = 0.03, 0.06, and 0.1, respectively, from the study of UV visible spectroscopy. The study of dielectric properties of the samples reveals the presence of Maxwell–Wagner type of polarization effect. The study of ac conductivity as a function of frequency and temperature suggests the presence of a thermally activated relaxation mechanism and got the highest value at x = 0.1. The study of modulus plots suggest the presence of short-range mobility of the charge carriers at low frequency, and oxygen vacancy, defect, and impurity may cause long-range mobility of charge carriers at a higher frequency. The study of the P-E loops suggests the possibility of the ferroelectric nature in the samples. Comparative study summaries that sample at x = 0.1 is having better physical properties compared to the other two compositions.

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Acknowledgements

Authors are thankful to the host institution for the XRD characterization.

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  1. Department of Physics, ITER, Siksha O Anusandhan Deemed to Be University, 751030, Bhubaneswar, India

    Pratyus Acharya, R. N. P. Choudhary & S. K. Parida

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  1. Pratyus Acharya
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Acharya, P., Choudhary, R.N.P. & Parida, S.K. Effect of Lanthanum on Structural, Dielectric, Electrical, and Optical Properties of the Bismuth Ferrite. Braz J Phys 54, 17 (2024). https://doi.org/10.1007/s13538-023-01391-w

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