Add time:09/10/2019         Source:sciencedirect.com

Ion mobility, phase transitions, thermal and electrophysical properties in (NH4)6LiZr3HfF23 and (NH4)6LiZrHf3F23 fluorides have been studied by 1H, 19F NMR, X-ray diffraction, DSC and impedance spectroscopy. The types of ion motions in the fluoride and ammonium sublattices of the fluorides have been determined in temperature range of 150–450 K and their activation energy was estimated. The presence of order-disorder phase transition in these fluorides in the temperature range of 400–450 K with the formation of metastable high-temperature β–modifications in which diffusion of fluoride and ammonium ions is the dominant type of ionic motion is established. The values of conductivity at 453 K [(~ 9.4–6.6) × 10–3 S/cm] indicate that the studied fluorides belong to the class of superionic conductors.

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