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Structural, microstructural and dielectric studies of tin-doped barium niobate perovskite

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Abstract

Monophasic oxides of the type Ba(Nb1-x Sn x ) O3 (0  ≤  x  ≤  1) have been synthesized by solid-state reaction method. All these compounds are found to have tetragonal structure except x = 1. The cell parameters and their variation with composition x have been determined. The X-ray density is found to increase gradually with increase of dopant concentration. Tolerance factor and volume of unit cell was found to be almost constant for all the compositions. Scanning electron microscopy showed the presence of grains of approximately 1 μm in size. Dielectric measurements in the frequency range 100 Hz to 1 MHz and in the temperature range from  − 100°C to 500°C has been carried out to determine the dielectric parameters. A strong frequency dependence of both dielectric constant (ɛ′) and dielectric loss (D) is observed in the frequency range 100 Hz to 100 kHz. At low frequency, the piling up of mobile charge carriers at the grain boundary produces interfacial polarization giving rise to high dielectric constant. Dielectric loss showed a typical behaviour in the temperature and frequency range studied.

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Acknowledgements

One of the authors (GCM) would like to thank University Grants Commission, New Delhi, India, for sanction of minor research project and award of teacher fellowship. Authors are thankful to the Department of Physics, Gulbarga University, Gulbarga, India and Banaras Hindu University, Varanasi, India, for extending dielectric measurement facility. The authors are also grateful to the staff members of Department of Applied Electronics and Department of Materials Science for their kind encouragement.

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Authors and Affiliations

  1. Department of Applied Electronics, Gulbarga University, Gulbarga, 585 106, Karnataka, India

    Girija Chitgopikar, Mallikarjun Chickpatil & Ravindra L. Raibagkar

  2. Department of Physics, V.G. Womens’ College, Gulbarga, 585 102, Karnataka, India

    Girija Chitgopikar

  3. Department of Electronics, B. V. B. College, Bidar, 585 403, Karnataka, India

    Mallikarjun Chickpatil

  4. Department of Materials Science, Gulbarga University, Gulbarga, 585 106, Karnataka, India

    Ravindra L. Raibagkar

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  1. Girija Chitgopikar
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  2. Mallikarjun Chickpatil
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  3. Ravindra L. Raibagkar
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Correspondence to Ravindra L. Raibagkar.

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Chitgopikar, G., Chickpatil, M. & Raibagkar, R.L. Structural, microstructural and dielectric studies of tin-doped barium niobate perovskite. J Mater Sci: Mater Electron 17, 963–970 (2006). https://doi.org/10.1007/s10854-006-0035-y

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