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Studies on frequency dependent electrical and dielectric properties of sintered zinc oxide pellets: effects of Al-doping

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Abstract

Sintered pellets of zinc oxide (ZnO), both undoped and Al-doped are prepared through a chemical process. Dopant concentration of Aluminium in ZnO [Al/Zn in weight percentage (wt%)] is varied from 0 to 3 wt%. After synthesis structural characterisation of the samples are performed with XRD and SEM-EDAX which confirm that all the samples are of ZnO having polycrystalline nature with particle size from 108.6 to 116 nm. Frequency dependent properties like a.c. conductivity, capacitance, impedance and phase angle are measured in the frequency range 10 Hz to 100 kHz as a function of temperature (in the range 25–150 °C). Nature of a.c. conductivity in these samples indicates hopping type of conduction arising from localised defect states. The frequency and temperature dependent properties under study are found to be as per correlated barrier hoping model. Dielectric and impedance properties studied in the samples indicate distributed relaxation, showing decrease of relaxation time with temperature.

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Acknowledgments

The authors thank Prof U.K. Mohanty, Department of Material Science, NIT Rourkela and Dr. S. Bal, Department of Physics, NIT Silchar for their help in obtaining the SEM-EDAX data.

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Authors and Affiliations

  1. Department of Physics, Karimganj College, Karimganj, Assam, India

    S. Tewari

  2. Centre for Condensed Matter Physics, Karimganj College, Karimganj, Assam, India

    S. Tewari

  3. National Institute of Technology Silchar, Silchar, Assam, 788010, India

    A. Ghosh & A. Bhattacharjee

  4. Don Bosco College, Tura, Meghalaya, India

    A. Ghosh

  5. National Institute of Technology Meghalaya, Shillong, India

    A. Bhattacharjee

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  1. S. Tewari
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  2. A. Ghosh
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Correspondence to S. Tewari.

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Tewari, S., Ghosh, A. & Bhattacharjee, A. Studies on frequency dependent electrical and dielectric properties of sintered zinc oxide pellets: effects of Al-doping. Indian J Phys 90, 1247–1255 (2016). https://doi.org/10.1007/s12648-016-0858-1

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  • DOI: https://doi.org/10.1007/s12648-016-0858-1

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