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Barium deficiency and sintering temperature effects on structural and transport properties of La0.5Eu0.2Ba0.3−x□xMnO3 manganites

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Abstract

La0.5Eu0.2Ba0.3−x□xMnO3 (x = 0.00, 0.05 and 0.15) samples were prepared using sol–gel method and annealed at Ts = 750 and 950 °C. The X-ray diffraction technique shows that all samples crystallize in the rhombohedral structure with R-3c space group. Electrical properties of the prepared compounds were investigated using impedance spectroscopy technique in a wide temperature range (80–440 K). The results show a semiconductor behavior for all samples. From dc-conductivity (σdc) analysis, it is observed that increasing barium-deficiency content and sintering temperature improves the electrical conductivity. It is also found that the conduction mechanism is governed by hopping process. Ba-deficiency and sintering temperature affects the activation energy (Ea). From σdc, in the temperature range of 250–480 K and at Ts = 750 °C, it is found that Ea1 decreases from 190 meV for x = 0.00 to 164 meV for x = 0.15. Also, for x = 0.00, Ea1 decreases from 165 meV at Ts = 750 °C to 145 meV at Ts = 950 °C. Complex impedance analysis indicates the presence of non-Debye type relaxation. Such analysis confirms the contribution of grain boundary on the conduction. The activation energy Ea2 deduced from dc-conductivity matches very well with the value estimated from relaxation time (Eaτ) indicating that relaxation and transport mechanisms are related to the same defect.

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Authors and Affiliations

  1. Unité de Recherche Matériaux Avancés et Nanotechnologies (URMAN), Institut Supérieur des Sciences Appliquées et de Technologie de Kasserine, Kairouan University, BP 471, 1200, Kasserine, Tunisia

    Amira khlifi, A. Mleiki & H. Rahmouni

  2. LT2S, Digital Research Center of Sfax, Sfax Technoparc, 3021, Sfax, Tunisia

    A. Mleiki & A. Cheikhrouhou

  3. Laboratoire Génie des Matériaux et Environnement (LGME), Ecole Nationale d’Ingénieurs de Sfax (ENIS), Université de Sfax, Sfax, Tunisia

    N. Guermazi

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

    K. Khirouni

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  1. Amira khlifi
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khlifi, A., Mleiki, A., Rahmouni, H. et al. Barium deficiency and sintering temperature effects on structural and transport properties of La0.5Eu0.2Ba0.3−x□xMnO3 manganites. J Mater Sci: Mater Electron 30, 19513–19523 (2019). https://doi.org/10.1007/s10854-019-02317-6

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