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Electrical properties of bulk and nano Li2TiO3 ceramics: A comparative study

Journal of Advanced Ceramics volume 3, pages 89–97 (2014)Cite this article

Abstract

Nanocrystalline and bulk Li2TiO3 having monoclinic structure were prepared by mechanical alloying as well as conventional ceramic route. Complex impedance analysis in the frequency range of 100 Hz-1 MHz over a wide range of temperature (50–500 °C) indicates the presence of grain boundary effect along with the bulk contribution. The frequency-dependent conductivity plots exhibit power law dependence, suggesting three types of conduction in the material: low-frequency (100 Hz-1 kHz) conductivity showing long-range translational motion of electrons (frequency independent), mid-frequency (1–10 kHz) conductivity showing short-range hopping of charge carriers and high-frequency (10 kHz-1 MHz) conductivity showing conduction due to localized orientation of hopping mechanism. The electrical conductivity measurement of nanocrystalline and bulk Li2TiO3 with temperature shows the negative temperature coefficient of resistance (NTCR) behavior. The activation energy (0.77 eV for nano sample and 0.88 eV for bulk sample) study shows the conduction mechanism in both samples. The low activation energies of the samples suggest the presence of singly ionized oxygen vacancies in the conduction process.

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Affiliations

  1. School of Applied Sciences, KIIT University, Bhubaneswar, 751 024, India

    Umasankar Dash, S. K. S. Parashar & Kajal Parashar

  2. Department of Electrical and Electronics Engineering, Trident Academy of Technology, Bhubaneswar, 751 024, India

    Subhanarayan Sahoo

  3. Institute for Plasma Research, Bhat, Gandhinagar, 382 428, India

    Paritosh Chaudhuri

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  1. Umasankar Dash
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  2. Subhanarayan Sahoo
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  3. Paritosh Chaudhuri
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  4. S. K. S. Parashar
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  5. Kajal Parashar
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Correspondence to Umasankar Dash.

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Dash, U., Sahoo, S., Chaudhuri, P. et al. Electrical properties of bulk and nano Li2TiO3 ceramics: A comparative study. J Adv Ceram 3, 89–97 (2014). https://doi.org/10.1007/s40145-014-0094-0

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  • DOI: https://doi.org/10.1007/s40145-014-0094-0

Keywords

  • nanocrystalline
  • complex impedance spectroscopy (CIS)
  • AC conductivity
  • X-ray diffraction (XRD)