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.
Highlights
Among the most important classes of materials possessing a diversity in their magnetic, electrical, electronic, and optical properties are the spinel ferrites [1]
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” model between neighbors’ sites
Rietveld fitted of X-ray diffraction (XRD) pattern reveals the cubic structure of the sample having a space group of Fd3m
Summary
Version of Record: A version of this preprint was published at Journal of Materials Science: Materials in Electronics on April 15th, 2021. M.L. Bouazizi Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax, 3000, Sfax, Tunisie. Research unit of valorization and optimization of exploitation of resources, Faculty of Science and Technology of Sidi Bouzid, Kairouan University, 9100 Sidi Bouzid, Tunisia. College of Engineering, Prince Sattam Bin Abdulaziz University, 655, Al Kharj 11942, Saudi Arabia
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