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Impedance and AC conductivity analysis of La-substituted 0.67BiFeO3–0.33BaTiO3 solid solution

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Abstract

The solid solution of 0.67% Bi0.95La0.05FeO3–0.33% BaTiO3 (BLF–BT) was made by the sol–gel method. The sample's structural, microstructural, and electrical properties were investigated by XRD, SEM, and dielectric measurement, respectively. The BLF–BT shows insulating behavior as revealed from the complex impedance analysis and AC conductivity analysis. The sintered BLF–BT shows relative permittivity of the order of – 106 at high temperatures and follows the Maxwell–Wagner relaxation. Two charge carrier species were responsible for the relaxation process at low and high temperatures. The conduction in the sample is explained with the help of the jump relaxation model (JRM). Room temperature AC conductivity of the BLF–BT samples was observed to be – 10−7 S/cm, lower than that reported in literature. Impedance and modulus analysis was carried out to find out the conduction mechanism. The complex modulus analysis shows almost equal grain and grain boundary capacitances (variation in capacitance is of the order of – 2) in comparison to the resistances (variation in resistance is of the order of – 8). Further, leakage current mechanism is dominated by space charge-limited conduction (SCLC) in our BLF–BT ceramics.

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Acknowledgements

The authors would like to acknowledge the Department of MEMS and IRCC at IIT Bombay for providing broadband dielectric measurement facility.

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  1. School of Physics and Materials Science, Thapar Institute of Engineering and Technology, Patiala, Punjab, 147004, India

    P. P. S. Bhadauria & Jayant Kolte

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Conceptualization: JK. Methodology: PPSB and JK. Formal analysis and investigation: PP SB and JK. Writing—review and editing: PPSB and JK.

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Correspondence to Jayant Kolte.

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Bhadauria, P.P.S., Kolte, J. Impedance and AC conductivity analysis of La-substituted 0.67BiFeO3–0.33BaTiO3 solid solution. Appl. Phys. A 128, 465 (2022). https://doi.org/10.1007/s00339-022-05600-2

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