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Investigation of microstructure and dielectric behavior of Bi2/3Cu3−xMgxTi4O12 (x = 0, 0.05, 0.1 and 0.2) ceramics synthesized by semi-wet route

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Abstract

In this manuscript, we have reported the synthesis and characterization of Mg-doped and undoped BCTO ceramic (Bi2/3Cu3−xMgxTi4O12, x = 0, 0.05, 0.1 and 0.2) sintered at 1173 K for 8 h, which have been prepared by the semi-wet route. The single-phase formation of ceramic was approved by the XRD pattern. The microstructural properties were studied by TEM and AFM. The samples were characterized by dielectric and impedance spectroscopic properties. The dielectric constant (εr) was calculated to be 3024 for BCTO ceramics at 423 K and 100 Hz. The tangent loss (tan δ) value was calculated to be 0.45 for BCTO ceramic at 423 K and 10 kHz. The internal Barrier Layer Capacitance (IBLC) mechanism was responsible for the high value of the dielectric constant. XPS spectroscopy confirmed the oxidation state of the elements present in the ceramic. It was observed from Impedance and modulus studies that there was the existence of the Maxwell–Wagner form of relaxation in the ceramics. In the temperature range 300–500 K, the Bi2/3Cu3−xMgxTi4O12 (where x = 0, 0.05, 0.1, 0.2) ceramic follows Arrhenius behavior with an almost single slope.

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Acknowledgements

Vishnu Shankar Rai thanks Head, Department of Chemistry, IIT(BHU) Varanasi, India, for the continuation of financial assistance as DST- INSPIRE fellowship. The authors are thankful to the Incharge, CIFC, IIT(BHU) Varanasi for providing TEM, XPS, and AFM facilities.

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  1. Department of Chemistry, Indian Institute of Technology Banaras Hindu University, Varanasi, U.P., 221005, India

    Vishnu Shankar Rai, Santosh Pandey, Vinod Kumar, Manish Kumar Verma, Manish Kumar Verma, Atendra Kumar, Atendra Kumar, Shruti Singh, Dinesh Prajapati & K. D. Mandal

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  1. Vishnu Shankar Rai
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  2. Santosh Pandey
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Rai, V.S., Pandey, S., Kumar, V. et al. Investigation of microstructure and dielectric behavior of Bi2/3Cu3−xMgxTi4O12 (x = 0, 0.05, 0.1 and 0.2) ceramics synthesized by semi-wet route. J Mater Sci: Mater Electron 32, 7671–7680 (2021). https://doi.org/10.1007/s10854-021-05483-8

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