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Structural, AC conductivity, conduction mechanism and dielectric properties of La0.62Eu0.05Ba0.33Mn0.85Fe0.15O3 ceramic compound

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Abstract

The new perovskite compound La0.62Eu0.05Ba0.33Mn0.85Fe0.15O3 was successfully synthesized via the sol–gel process. X-ray diffraction revealed that our sample is pure and crystallizes in the orthorhombic structure with Pbnm space group. Electrical properties were performed using the complex impedance spectroscopy technique in the range of frequency (40–10 MHz) and at various temperatures (80–400 K). AC-conductivity results are well described by the universal Jonsher’s power law at low temperatures and the DC-conductivity data are well fitted by the small polaron hopping model at high temperatures. Impedance results show a negative temperature coefficient of resistance (NTCR) which discloses the semiconductor behaviour of the studied sample. Nyquist plots were well fitted by an equivalent circuit involving the contribution of grain and grain boundaries in the conduction process. Giant dielectric values, useful in electronic devices, were obtained. Moreover, a relaxation diffuse phase transition is attributed to a strong heterogeneity in A and B sites of the studied perovskite.

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Acknowledgements

This work has been supported by the Tunisian Ministry of Higher Education and Scientific Research.

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Authors and Affiliations

  1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, B. P. 1171, 3000, Sfax, Tunisia

    W. Ncib, A. Ben Jazia Kharrat, N. Chniba-Boudjada & W. Boujelben

  2. Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l’Environnement, Faculté des Sciences de Gabès, Université de Gabès, cité Erriadh, 6079, Gabès, Tunisia

    M. Saadi & K. Khirouni

  3. Institut Néel, B.P. 166, 38042, Grenoble Cedex 9, France

    N. Chniba-Boudjada

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Ncib, W., Ben Jazia Kharrat, A., Saadi, M. et al. Structural, AC conductivity, conduction mechanism and dielectric properties of La0.62Eu0.05Ba0.33Mn0.85Fe0.15O3 ceramic compound. J Mater Sci: Mater Electron 30, 18391–18404 (2019). https://doi.org/10.1007/s10854-019-02193-0

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