Abstract
Polycrystalline Mg0.5Co0.5Fe1.6Al0.4O4 ferrite was prepared using sol–gel method. This sample was characterized by powder X-ray diffraction (XRD), Scanning electron microscopy, and impedance spectroscopy. XRD analysis combined with the Rietveld refinement confirmed the cubic-spinel structure (SG: \(Fd\stackrel{-}{3}m\)) for the prepared sample. Electrical conductivity obeying the Jonscher power law indicates that the prepared material exhibits semiconductor behavior, and the conduction process follows the “non-overlapping small polaron tunnelling, NSPT” model between neighbors’ sites. The behavior of dielectric constants such as permittivity and loss coefficient has been interpreted based on the Maxwell–Wagner’s theory of interfacial polarization. The curves of imaginary parts of impedance (Z″) and modulus (M″) show dielectric-relaxation phenomenon in the sample with activation energy near to that determined from the dc conductivity study. Nyquist plots (− Z″ vs. Z′) show a monotonic decrease in both grain resistance (Rg) and grain boundary resistance (Rgb) with increasing temperature such as Rgb ≫ Rg. This result confirms that the transport mechanism in Mg0.5Co0.5Fe1.6Al0.4O4 compound is governed by the grain boundaries effect.
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Notes
For spinel ferrites having general formula of \({{({M}_{1-\delta }^{2+}{Fe}_{\delta }^{3+})}_{A}{{[{M}_{\delta }^{2+}Fe}_{2-\delta }^{3+}]}_{B}O}_{4}^{2-}\), where M is a divalent metal cation, the inversion degree (δ) is defined as the fraction of A sites occupied by Fe3+ cations [28].
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Acknowledgements
The authors acknowledge the support of the Tunisian Ministry of Higher Education and Scientific Research in the field of scientific research and technology.
Funding
The authors extend their appreciation to the Deanship of Scientific Research at Prince Sattam Bin Abdulaziz University for funding this research work through the Project Number 2020/01/16565.
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Dabbebi, T., Hcini, S., Alzahrani, B. et al. Investigations of microstructural and impedance spectroscopic properties of Mg0.5Co0.5Fe1.6Al0.4O4 ferrite prepared using sol–gel method. J Mater Sci: Mater Electron 32, 12521–12534 (2021). https://doi.org/10.1007/s10854-021-05887-6
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DOI: https://doi.org/10.1007/s10854-021-05887-6