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Solid Electrolytes Based on KAlO2-TiO2: The Crystalline Structure and Conduction

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Abstract

The structure of solid high-conductance potassium electrolytes K1 − x Al1 − x TixO2 (x = 0.1; 0.2) at 25 and 575°C is studied by a powder neutron diffraction analysis with the application of full-profile Rietveld analysis. Inserting titanium ions removes in potassium aluminate the phase transition at 540°C and the conductance anisotropy typical for its low-temperature form. Both structures are identical (fcc lattice, space group Fd3m). Experiment and calculation coincide best under the assumption that the potassium sublattice is disordered. The conductance increase upon inserting ions Ti4+ is due, apart from stabilization of the fcc structure, to formation of additional potassium vacancies and larger channels for the migration of potassium cations (ions Ti4+ are larger than ions Al3+).

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REFERENCES

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 22, Yekaterinburg, 620219, Russia

    E. I. Burmakin & G. Sh. Shekhtman

  2. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620219, Russia

    V. I. Voronin & L. Z. Akhtyamova

  3. Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences, ul. Pervomayskaya 91, Yekaterinburg, 620219, Russia

    I. F. Berger

Authors
  1. E. I. Burmakin
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  2. V. I. Voronin
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  3. L. Z. Akhtyamova
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  4. I. F. Berger
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  5. G. Sh. Shekhtman
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Correspondence to E. I. Burmakin.

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__________

Translated from Elektrokhimiya, Vol. 41, No. 7, 2005, pp. 878–883.

Original Russian Text Copyright © 2005 by Burmakin, Voronin, Akhtyamova, Berger, Shekhtman.

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Burmakin, E.I., Voronin, V.I., Akhtyamova, L.Z. et al. Solid Electrolytes Based on KAlO2-TiO2: The Crystalline Structure and Conduction. Russ J Electrochem 41, 783–788 (2005). https://doi.org/10.1007/s11175-005-0139-3

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  • DOI: https://doi.org/10.1007/s11175-005-0139-3

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