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Structural, Optical and Impedance Spectroscopic Characterizations of Nanocrystalline A2Ti2Zr5O16 (A = Mg, Ca, Ba and Sr)

Journal of Electronic Materials volume 47, pages 2417–2428 (2018)Cite this article

Abstract

A nanocrystalline A2Ti2Zr5O16 (A = Mg, Ca, Ba and Sr) system has been synthesized by a modified combustion technique. The cation-deficient calzirtite (Ca2Ti2Zr5O16) is found to be a tetragonal structure with the space group I4(1)/acd. The average size of the particle from the transmission electron microscopy image is estimated to be 23.30 nm and 20.16 nm for Ca2Ti2Zr5O16 and Ba2Ti2Zr5O16, respectively. The optical bandgap calculated using a Tauc plot is between 3.01 eV and 3.46 eV. Raman and Fourier transform infrared spectroscopy (FTIR) studies were carried out to confirm the phase purity of the sample. The scanning electron microscopy (SEM) image of a Ca2Ti2Zr5O16 sample sintered at 1360°C for 3 h shows minimum porosity with 96% of the theoretical density. The frequency-dependent dielectric study shows that the dielectric constant is maximized at low frequencies and decreases as the frequency increases. The Cole–Cole plot reveals that the material exhibits conduction due to the contributions of grain, grain boundary and electrode effects. The photoluminescence spectra of the samples were recorded and the transitions causing emission have been identified.

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Acknowledgements

The authors acknowledge the Kerala State Council for Science, Technology and Environment, Government of Kerala for financial assistance.

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  1. Department of Physics, Mar Ivanios College, Thiruvananthapuram, 695015, India

    K. Sandeep, Jijimon K. Thomas & Sam Solomon

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  1. K. Sandeep
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  2. Jijimon K. Thomas
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Correspondence to Sam Solomon.

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Sandeep, K., Thomas, J.K. & Solomon, S. Structural, Optical and Impedance Spectroscopic Characterizations of Nanocrystalline A2Ti2Zr5O16 (A = Mg, Ca, Ba and Sr). J. Electron. Mater. 47, 2417–2428 (2018). https://doi.org/10.1007/s11664-018-6077-0

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  • DOI: https://doi.org/10.1007/s11664-018-6077-0

Keywords

  • Nanostructure
  • combustion synthesis
  • calzirtite
  • ionic conduction