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Electrical and optical properties of pure and zirconium added dysprosium titanates

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Abstract

Nanoparticles of Dy2Ti2O7 and Dy2Ti1.5Zr0.5O7 (abbreviated as DTO and DTZO, respectively) have been prepared through an auto-igniting combustion technique. The structure of the system is analyzed by powder X-ray diffraction and vibrational spectroscopic tools. The samples are crystallized with cubic pyrochlore structure with the space group \(Fd\bar {3}m\). The particle size obtained from XRD and TEM analysis shows that the samples are nanocrystalline. The Fourier-transform infrared and Raman spectra of the samples are investigated in detail. The ultraviolet–visible absorption spectra of the samples are also recorded and their optical bandgap energy values are calculated. The photoluminescence spectra of the samples are recorded and the transitions causing emissions are identified. The surface morphology of the sintered pellets were studied by scanning electron microscopy which indicates minimum porosity, and the elemental composition was confirmed by energy-dispersive spectrometry. Impedance spectroscopic studies of the samples are carried out at different temperatures. The conductivity of the samples increased with temperature, and the highest conductivity of 1.93 × 10−1 S/m at 850 °C is obtained for DTO. The materials are suitable candidates for optoelectronic applications and the fabrication of electrolytes in solid oxide fuel cells at moderate temperatures.

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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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Authors and Affiliations

  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. Electrical and optical properties of pure and zirconium added dysprosium titanates. J Mater Sci: Mater Electron 29, 7600–7612 (2018). https://doi.org/10.1007/s10854-018-8752-6

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  • DOI: https://doi.org/10.1007/s10854-018-8752-6

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