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Study of electrical and dielectric properties of CaMn0.6Fe0.4O2.8 perovskite

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Abstract

The electrical properties of CaMn0.6Fe0.4O2.8 perovskite sample have been investigated, using complex impedance analysis in 102–5.22 × 106 Hz frequency range with varying temperature from 293 to 348 K. SEM micrograph shows that the sample exhibits well-developed grains with average particle size of about 320 nm. Rietveld analysis of XRD pattern shows that sample crystallizes in the orthorhombic structure with Pnma space group. The total conductance curves of the sample are found to obey Jonscher power law G(ω) = G DC +Aω n with an increase of frequency exponent (n) as temperature increases. The activation energy deduced from the analysis of the conductance is about 0.19 eV. The imaginary part (Z″) of the impedance is characterized by the appearance of peak which shifts to higher frequencies with the increase of temperature. Such behavior shows the existence of a relaxation process in our system. The impedance study using Nyquist representation revealed the appearance of semicircular arcs and an equivalent circuit, R 1 + (R 2 //C), has been proposed to explain the impedance results.

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Acknowledgments

This work is supported by The Tunisian National Ministry of Higher Education, Scientific Research and Technology. German Federal Ministry of Education and Research.

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Authors and Affiliations

  1. Laboratory of Applied Physics, Faculty of Sciences of Sfax, University of Sfax, PB 1171, 3000, Sfax, Tunisia

    T. Tahri, A. Omri & E. Dhahri

  2. Research Unit of Valuation and Optimization of Resource, Faculty of Science and Technology of Sidi Bouzid, University Campus Agricultural City Sidi Bouzid, University of Kairouan, 3100, Kairouan, Tunisia

    T. Tahri, A. Omri & S. Hcini

  3. Laboratory of Energy and Materials, High School of Sciences and Technologies of Hammam Sousse, University of Sousse, Road Lamine Abessi, 4011, Hammam Sousse, Tunisia

    N. Hamdaoui & L. Beji

  4. Laboratory of Energy and Materials, Research Group of Nano-Materials for Telecommunications, Higher Institute of Computer and Communication Technologies, University of Sousse, Gp1, 4011, Hammam Sousse, Tunisia

    N. Hamdaoui & L. Beji

  5. Institute of Materials and Surface Technology, University of Applied Sciences, Grenzstrasse 3, Kiel, Germany

    M. Es-Souni

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  1. T. Tahri
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  2. N. Hamdaoui
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  3. A. Omri
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  4. S. Hcini
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  5. L. Beji
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  6. E. Dhahri
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Correspondence to A. Omri.

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Tahri, T., Hamdaoui, N., Omri, A. et al. Study of electrical and dielectric properties of CaMn0.6Fe0.4O2.8 perovskite. J Mater Sci: Mater Electron 27, 10525–10531 (2016). https://doi.org/10.1007/s10854-016-5143-8

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  • DOI: https://doi.org/10.1007/s10854-016-5143-8

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