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Dielectric and impedance characteristics of Ba(Bi0.5Nb0.5)O3 ceramics

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Abstract

A lead free polycrystalline material Ba(Bi0.5Nb0.5)O3 was prepared using a high-temperature mixed oxide technique using high purity ingredients. The formation of the material in monoclinic crystal structure was confirmed by an X-ray structural analysis at room temperature. The nature and texture of microstructure by scanning electron microscopy show that the compound has well defined grains uniformly distributed throughout the surface of the sample. Detailed studies of dielectric and impedance properties of the material, carried out in the frequency range of (1 kHz–1 MHz) at different temperatures (30 °C to 475 °C), have shown many interesting properties. Dielectric study showed an existence of diffuse phase transition around 317 °C. The temperature dependence of impedance parameters (impedance, modulus etc.) of the material exhibits a strong correlation of its micro-structure (i.e., bulk, grain boundary, etc.) with the electrical parameters. An existence of negative temperature coefficient of resistance (NTCR) type behavior in the material similar to that of semiconductors was also observed. The complex electric modulus analysis indicates the existence of hopping conduction mechanism in the system with non-exponential type of conductivity relaxation. The nature of variation of dc conductivity with temperature confirms the Arrhenius behavior of the material. The ac conductivity spectra show a typical signature of an ionic conducting system, and are found to obey Jonscher’s universal power law. The temperature dependent pre-exponential factor (A) shows peak and frequency exponent (n) possesses a minimum at transition temperature.

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Authors and Affiliations

  1. Department of Physics, Hi-Tech College of Engineering, Bhubaneswar, India

    B. C. Sutar

  2. Department of Physics, Govt. Autonomous College, Bhawanipatna, Odisha, India

    B. Pati

  3. Department of Physics, Institute of Technical Education and Research, S O A University, Bhubaneswar, 751030, India

    B. N. Parida, Piyush R. Das & R. N. P. Choudhary

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  1. B. C. Sutar
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  2. B. Pati
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  4. Piyush R. Das
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  5. R. N. P. Choudhary
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Correspondence to R. N. P. Choudhary.

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Sutar, B.C., Pati, B., Parida, B.N. et al. Dielectric and impedance characteristics of Ba(Bi0.5Nb0.5)O3 ceramics. J Mater Sci: Mater Electron 24, 2043–2051 (2013). https://doi.org/10.1007/s10854-012-1054-5

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  • DOI: https://doi.org/10.1007/s10854-012-1054-5

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