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AC conductivity and structural properties of Mg-doped ZnO ceramic

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Abstract

Undoped ZnO and Zn1−x Mg x O ceramic pellets were synthesized by the standard sintering method at the temperature of 1200 °C. The influence of Mg doping on the morphological, structural and electrical properties was studied. The scanning electron microscopy images revealed rough surface textured by grain boundaries and compacted grains having different shapes and sizes. Indeed, the X-ray diffraction reveals the alloying of hexagonal ZnMgO phase and the segregation of cubic MgO phase. The crystallite size, strain and stress were studied using Williamson–Hall (W–H) method. The results of mean particle size of Zn1−x Mg x O composites showed an inter-correlation with W–H analysis and Sherrer method. The electrical conductivity of the films was measured from 173 to 373 K in the frequency range of 0.1 Hz–1 MHz to identify the dominant conductivity mechanism. The DC conductivity is thermally activated by electron traps having activation energy of about 0.09 to 0.8 eV. The mechanisms of AC conductivity are controlled by the correlated barrier hopping model for the ZnO sample and the small polaron tunneling (SPT) model for Zn0.64Mg0.36O and Zn0.60Mg0.40O composites.

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Authors and Affiliations

  1. Laboratory of Composite Ceramic and Polymer Materials, Scientific Faculty of Sfax, 4000, Sfax, Tunisia

    Zayani Jaafar Othman, Olfa Hafef & Adel Matoussi

  2. Institute of Materials for Electronics and Magnetism (IMEM), Parma University, 43124, Parma, Italy

    Francesca Rossi & Giancarlo Salviati

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  1. Zayani Jaafar Othman
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  2. Olfa Hafef
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  3. Adel Matoussi
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  5. Giancarlo Salviati
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Correspondence to Zayani Jaafar Othman.

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Othman, Z.J., Hafef, O., Matoussi, A. et al. AC conductivity and structural properties of Mg-doped ZnO ceramic. Appl. Phys. A 121, 625–634 (2015). https://doi.org/10.1007/s00339-015-9447-y

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