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Structural, Electrical and Dielectric of Fe-Doped CaMn1−xFexO3−0.5x (x = 0.0 and 0.20)

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Abstract

This work focuses on the structural and electrical properties of CaMn1−xFexO3−0.5x (x = 0.0 and 0.20) perovskite compounds prepared using the ceramic method. XRD patterns confirm the formation of the orthorhombic structure with Pnma space group for the samples, and Rietveld method was used to estimate their different structural parameters. Refinement results show that the cell parameters and unit cell volume increase with increasing Fe content. The complex impedance spectroscopy technique was used to investigate the frequency and temperature dependence of electrical conductance and electrical impedance. The total conductance curves of the sample are found to obey Jonscher power law GT(ω) = Gdc + Gac = Gdc + Aωn with an increase in frequency exponent (n) as temperature increases. Electrical impedance results show the presence of the electrical relaxation phenomenon for the samples. The activation energy deduced from the analysis of the conductance curves matches very well with the value estimated from the relaxation time, indicating that relaxation process and electrical conductivity are attributed to the same defect. The Nyquist representations have been analyzed using a proposed electrical circuit, and the results show that the grain boundary contribution is responsible to the conduction mechanism of the prepared samples.

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Acknowledgements

This work is supported by the Tunisian National Ministry of Higher Education, Scientific Research and Technology. This work was supported by funds from FEDER (Programa Operacional Factores de Competitividade COMPETE) and from FCT-Fundação para a Ciência e a Tecnologia under the Project No. UID/FIS/04564/2016. Access to TAIL-UC facility (XRD, SEM and DSC) funded under QREN-Mais Centro Project No. ICT_2009_02_012_1890 is gratefully acknowledged.

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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, A. Benali & E. Dhahri

  2. Research Unit of Optimization and Valuation of Resource, Faculty of Science and Technology of Sidi Bouzid, University of Kairouan, University Campus Agricultural City, 9100, Sidi Bouzid, Tunisia

    T. Tahri, A. Omri, S. Hcini & E. Dhahri

  3. Energy Materials Laboratory, Graduate School of Sciences and Technologies, University of Sousse, Street LamineAbessi, 4011, Hammam Sousse, Tunisia

    N. Hamdaoui

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

    N. Hamdaoui

  5. Laboratoire Ondes et Matière d’Aquitaine (LOMA), UMR 5798, CNRS, Universite de Bordeaux, 33405, Talence Cedex, France

    I. Gammoudi

  6. Laboratoire des Sciences des Matériaux et d’Environnement, Faculté des sciences de Sfax, route de soukra, BP 1171, 3000, Sfax, Tunisia

    S. Chaabouni

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  1. T. Tahri
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  2. A. Omri
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Correspondence to A. Omri.

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Tahri, T., Omri, A., Hamdaoui, N. et al. Structural, Electrical and Dielectric of Fe-Doped CaMn1−xFexO3−0.5x (x = 0.0 and 0.20). J Low Temp Phys 195, 230–251 (2019). https://doi.org/10.1007/s10909-019-02157-y

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