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Investigation of density of states and electrical properties of Ba0.5Co0.5Bi2Nb2O9 nanoceramics prepared by chemical route

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Abstract

Barium-cobalt-bismuth-niobate, Ba0.5Co0.5Bi2Nb2O9 (BCoBN) nanocrystalline ferroelectric ceramic was prepared through chemical route. XRD analysis showed single phase layered perovskite structure of BCoBN when calcined at 650 °C, 2 h. The average crystallite size was found to be 18 nm. The microstructure was studied through scanning electron microscopy. The dielectric and ferroelectric properties were investigated in the temperature range 50–500 °C. The dielectric constant and dielectric loss plot with respect to temperature both indicated strong relaxor behavior. Frequency versus complex impedance plot also supported the relaxor properties of the material. The impedance spectroscopy study showed only grain conductivity. Variation of ac conductivity study exhibited Arrhenius type of electrical conductivity where the hopping frequency shifted towards higher frequency region with increasing temperature. The ac conductivity values were used to evaluate the density of state at the Fermi level. The minimum hopping distance was found to be decreased with increasing temperature.

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Acknowledgements

Author thanks SERB, DST, New Delhi, India for financial support (Grant No. SR/FT-CS-125, 2010).

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Authors and Affiliations

  1. Department of Chemistry, Sidho-Kanho-Birsha University, Purulia, 723104, India

    Mrinal K. Adak, Shyam S. Mondal & Debasis Dhak

  2. Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, Blindern, 0315, Oslo, Norway

    Prasanta Dhak

  3. Sensors and Actuator Division, Central Glass and Ceramic Research Institute, Kolkata, India

    Shrabanee Sen

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  1. Mrinal K. Adak
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  2. Shyam S. Mondal
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  3. Prasanta Dhak
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Correspondence to Debasis Dhak.

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Adak, M.K., Mondal, S.S., Dhak, P. et al. Investigation of density of states and electrical properties of Ba0.5Co0.5Bi2Nb2O9 nanoceramics prepared by chemical route. J Mater Sci: Mater Electron 28, 4676–4683 (2017). https://doi.org/10.1007/s10854-016-6107-8

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