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Electrophysical properties of bismuth titanates with the pyrochlore structure Bi1.6M x Ti2O7–δ (M = In, Li)

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Abstract

Lithium-containing bismuth titanates with the pyrochlore-type structure Bi1.6LixTi2O7–δ were obtained for the first time. The formation of the pyrochlore phase was confirmed by X-ray diffraction analysis, scanning electron microscopy and local microanalysis. In Bi1.6MxTi2O7–δ, the lithium and indium are occupied the bismuth sites, primarily. The electrophysical properties of doped bismuth titanates were studied by impedance spectroscopy in the frequency range 1–106 Hz. In the low-temperature range (of up to ~400°C), electron conductivity predominates; above 400°C, the oxygen-ion type of conductivity is revealed. In the range p(O2) = 0.21–1 atm, the average value of the sum of ion transport numbers is 0.5 at 500–550°C. The relaxation process was found from the frequency dependences of the dielectric parameters (ε', tan δ, M''), which was of the same type for systems with different dopants (In, Li) probably due to the hopping mechanism of oxygen conductivity.

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Authors and Affiliations

  1. Institute of Chemistry, Komi Scientific Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, 167982, Russia

    A. G. Krasnov, I. V. Piir & N. A. Sekushin

  2. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990, Russia

    Ya. V. Baklanova & T. A. Denisova

Authors
  1. A. G. Krasnov
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  2. I. V. Piir
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  3. N. A. Sekushin
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  4. Ya. V. Baklanova
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  5. T. A. Denisova
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Correspondence to A. G. Krasnov.

Additional information

Published on the basis of a report delivered at the 13th International Meeting “Fundamental Problems of Solid State Ionics,” Chernogolovka, 2016.

Original Russian Text © A.G. Krasnov, I.V. Piir, N.A. Sekushin, Ya.V. Baklanova, T.A. Denisova, 2017, published in Elektrokhimiya, 2017, Vol. 53, No. 8, pp. 972–979.

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Krasnov, A.G., Piir, I.V., Sekushin, N.A. et al. Electrophysical properties of bismuth titanates with the pyrochlore structure Bi1.6M x Ti2O7–δ (M = In, Li). Russ J Electrochem 53, 866–872 (2017). https://doi.org/10.1134/S1023193517080122

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  • DOI: https://doi.org/10.1134/S1023193517080122

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