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Internal Mobility, Phase Transitions, and Ionic Conductivity in Na(NH4)6Zr4F23 and Li(NH4)6Zr4F23

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Abstract

The dynamics of fluoride and ammonium ions in Na(NH4)6Zr4F23 (I) and Li(NH4)6Zr4F23 (II) was studied by 1H and 19F NMR in the temperature range 170-440 K. Types of ionic motion were determined, and their activation energies were evaluated. In I, phase transitions were found in the temperature ranges 360-370 and 410-415 K. The experimental values of conductivity σ of Na(NH4)6Zr4F23 and Li(NH4)6Zr4F23 (σ ≈ 4 × 10-3 S/cm at T = 420 K) permit one to attribute these fluorides to the class of superionic conductors.

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Authors and Affiliations

  1. Institute of Chemistry, Far East Branch, Russian Academy of Sciences, Vladivostok

    V. Ya. Kavun, V. I. Sergienko & T. F. Antokhina

  2. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Russia

    N. F. Uvarov

Authors
  1. V. Ya. Kavun
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  2. V. I. Sergienko
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  3. N. F. Uvarov
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  4. T. F. Antokhina
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Kavun, V.Y., Sergienko, V.I., Uvarov, N.F. et al. Internal Mobility, Phase Transitions, and Ionic Conductivity in Na(NH4)6Zr4F23 and Li(NH4)6Zr4F23. Journal of Structural Chemistry 43, 429–435 (2002). https://doi.org/10.1023/A:1020333031445

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