Abstract
The ion mobility, phase transitions (PTs), and conductivity in (NH4)6KZr4F23 (I) and (NH4)6KHf4F23 (II) have been studied by 1H and 19F NMR, DSC, and impedance spectroscopy. Types of ion motion in the fluorides and ammonium sublattices have been determined in the temperature range 150–480 K, and their activation energies have been evaluated. Compounds I and II undergo phase transitions in the temperature ranges 400–440 and 419–440 K, respectively, to form high-temperature modifications. The high ionic conductivity in (NH4)6KZr4F23 and (NH4)6KHf4F23 (>10−3 S/cm at 473 K) makes it possible to classify these compounds with superionic conductors.
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Original Russian Text © V.Ya. Kavun, T.F. Antokhina, N.N. Savchenko, A.B. Podgorbunsky, T.A. Kaidalova, 2015, published in Zhurnal Neorganicheskoi Khimii, 2015, Vol. 60, No. 5, pp. 681–690.
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Kavun, V.Y., Antokhina, T.F., Savchenko, N.N. et al. Internal mobility, phase transitions, and ionic conductivity in (NH4)6KZr4F23 and (NH4)6KHf4F23 . Russ. J. Inorg. Chem. 60, 610–618 (2015). https://doi.org/10.1134/S0036023615050095
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DOI: https://doi.org/10.1134/S0036023615050095