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Optical, dielectric relaxation and conduction study of Bi2Fe4O9 ceramic

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Abstract

Multiferroic bismuth ferrite Bi2Fe4O9 (BFO) ceramic was synthesized by conventional solid state reaction route. X-ray diffraction and Rietveld refinement show formation of single phase ceramic with orthorhombic crystal structure (space group ‘Pbam’). The morphological study depicted a well-defined grain of size ~2 μm. The optical studies were carried out by using UV–Vis spectrophotometer which shows a band gap of 1.53 eV and a green emission spectrum at 537 is observed in the Photoluminescence study. The frequency dependent dielectric study at various temperature revealed that the dielectric constant decreases with increase in frequency. A noticeable peak shift towards higher frequency with increasing temperature is observed in the frequency dependent dielectric loss plot. The impedance spectroscopy shows a substantial shift in imaginary impedance (Z″) peaks toward the high frequency side described that the conduction in material favoring the long range motion of mobile charge carriers. The presence of non-Debye type multiple relaxations has been confirmed by complex modulus analysis. The frequency dependent Ac conductivity at different temperatures indicates that the conduction process is thermally activated. The variation of Dc conductivity exhibited a negative temperature coefficient of resistance behavior. The activation energy calculated from impedance, modulus and conductivity data confirmed that the oxygen vacancies play a vital role in the conduction mechanism.

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Acknowledgments

AKS acknowledge Board of Research in Nuclear Science (BRNS), Mumbai (Sanction No: 2012/37P/40/BRNS/2145) and Department of Science and Technology (DST), New Delhi (Sanction No: SR/FTP/PS-187/2011) for funding. SRM and BS acknowledge BRNS and DST, India respectively for the financial support. Lastly, SRM is thankful to Dr. P. K. Sahoo, NISER (BBSR) for PL characterization and Tapabrata Dam for his useful suggestions.

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Authors and Affiliations

  1. Department of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha, 769008, India

    S. R. Mohapatra, B. Sahu, M. S. Pattanaik & A. K. Singh

  2. Department of Physics, C.V. Raman College of Engineering, Bhubaneswar, Odisha, 752054, India

    T. Badapanda

  3. UGC-DAE Consortium for Scientific Research Mumbai Centre, R-5 Shed, BARC, Mumbai, 400085, India

    S. D. Kaushik

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  1. S. R. Mohapatra
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  2. B. Sahu
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  3. T. Badapanda
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  4. M. S. Pattanaik
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  5. S. D. Kaushik
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  6. A. K. Singh
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Correspondence to T. Badapanda or A. K. Singh.

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Mohapatra, S.R., Sahu, B., Badapanda, T. et al. Optical, dielectric relaxation and conduction study of Bi2Fe4O9 ceramic. J Mater Sci: Mater Electron 27, 3645–3652 (2016). https://doi.org/10.1007/s10854-015-4203-9

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  • DOI: https://doi.org/10.1007/s10854-015-4203-9

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