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Effect of Co substitution on the structural, dielectric and optical properties of KBiFe2O5

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  • Received: 12 January 2020Revised: 23 May 2020Accepted: 28 May 2020Available online: 31 May 2020
  • Cobalt modified brownmillerite KBiFe2O5 [KBiFe2(1-x)Co2xO5 (x= 0, 0.05)] polycrystalline is synthesized following solid-state reaction route. Rietveld refinement of X-ray diffraction (XRD) data reveals the phase purity of KBiFe2O5 (KBFO) and KBiFe1.9Co0.1O5 (KBFCO). The optical band gap energy (Eg) of KBFO is observed to be decrease from 1.59 eV to 1.51 eV by Co substitution. The decrease in band gap attributes to the tilting in the Fe-O tetrahedral structure of KBFCO. The observed room temperature Raman peaks of KBFCO are shifted by 3 cm-1 towards lower wavenumber in comparison with KBFO Raman peaks. The shifting of Raman active modes can be attributed to the change in the bond angles and bond lengths of Fe-O tetrahedral and modification in oxygen deficiency in KBFO due to Co doping. The frequency-dependent dielectric constant and loss of KBFCO also decrease with respect to KBFO at room temperature, which is a consequence of the reduction in oxygen migration and modification in vibrational modes present in the sample.
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Effect of Co substitution on the structural, dielectric and optical properties of KBiFe2O5

  • Corresponding author:

    Anil K. Singh    E-mail: singhanil@nitrkl.ac.in

  • 1. Department of Physics and Astronomy, National Institute of Technology, Rourkela-769008, Odisha, India
  • 2. UGC-DAE Consortium for Scientific Research Mumbai Centre, R-5 Shed, BARC, Mumbai -400085, India

Abstract: Cobalt modified brownmillerite KBiFe2O5 [KBiFe2(1-x)Co2xO5 (x= 0, 0.05)] polycrystalline is synthesized following solid-state reaction route. Rietveld refinement of X-ray diffraction (XRD) data reveals the phase purity of KBiFe2O5 (KBFO) and KBiFe1.9Co0.1O5 (KBFCO). The optical band gap energy (Eg) of KBFO is observed to be decrease from 1.59 eV to 1.51 eV by Co substitution. The decrease in band gap attributes to the tilting in the Fe-O tetrahedral structure of KBFCO. The observed room temperature Raman peaks of KBFCO are shifted by 3 cm-1 towards lower wavenumber in comparison with KBFO Raman peaks. The shifting of Raman active modes can be attributed to the change in the bond angles and bond lengths of Fe-O tetrahedral and modification in oxygen deficiency in KBFO due to Co doping. The frequency-dependent dielectric constant and loss of KBFCO also decrease with respect to KBFO at room temperature, which is a consequence of the reduction in oxygen migration and modification in vibrational modes present in the sample.

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