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A study on the electrical and dielectric properties of SrGdxFe12−xO19 (x = 0.00–0.05) nanosized M-type hexagonal ferrites

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Abstract

Single-phase SrGdxFe12−xO19 (x = 0.00–0.05) nanosized M-type hexagonal ferrites (NHFs) were prepared via citrate sol–gel route. The formation of Gd substituted Sr-hexaferrites has been confirmed by XRD, SEM, TEM and EDX for all substitutions. The X-ray powder patterns revealed the hexagonal crystal structure of all products. The electrical and dielectric properties of SrGdxFe12−xO19 NHFs were investigated extensively with an impedance spectroscopy up to 3.0 MHz from 20 to 120 °C. Both electrical and dielectric components including ac/dc conductivity, dielectric constant, dielectric loss and lossy tangent were evaluated for measurement temperatures up to 120 °C. It has been indicated that ac conductivity generally complies with power law rules, mainly dependent on Gd3+-ion substitution ratios. The impedance analysis showed that due to the influence of various Gd3+-ion substitution ratios in the NHFs, the conduction mechanisms can mainly be attributed to the grain-grain boundaries. The dielectric constant of SrGdxFe12−xO19 NHFs owns a normal dielectric distribution with the frequency, largely due to varying substitution ratios. In other words, the variation of Gd3+-ion substitution can be used to modify the conduction mechanism of NHFs. Therefore, the observed change in dielectric properties as a function of frequency can be clarified on a phenomenological basis by Koop’s model of the electrical conduction mechanism in most composite ferrites.

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Authors and Affiliations

  1. Institute of Forensic Sciences and Legal Medicine, Istanbul University-Cerrahpasa, Buyukcekmece Campus, 34500, Buyukcekmece-Istanbul, Turkey

    B. Ünal

  2. Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam, 31441, Saudi Arabia

    M. A. Almessiere

  3. Department of Biophysics, Institute for Research and Medical Consultation (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam, 31441, Saudi Arabia

    M. A. Almessiere & Y. Slimani

  4. Department of Chemistry, Istanbul Medeniyet University, 34700, Uskudar-Istanbul, Turkey

    A. Demir Korkmaz

  5. Department of Nanomedicine Research, Institute for Research and Medical Consultation (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam, 31441, Saudi Arabia

    A. Baykal

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  1. B. Ünal
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Correspondence to M. A. Almessiere.

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Ünal, B., Almessiere, M.A., Slimani, Y. et al. A study on the electrical and dielectric properties of SrGdxFe12−xO19 (x = 0.00–0.05) nanosized M-type hexagonal ferrites. J Mater Sci: Mater Electron 32, 18317–18329 (2021). https://doi.org/10.1007/s10854-021-06373-9

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