Abstract
Thermal, electrophysical properties, ion mobility, and phase transitions (PT) in compounds (NH4)6CsZr4F23 (I) and (NH4)6CsHf4F23 (II) have been studied by 1H, 19F NMR, X-ray powder diffraction, DSC, and impedance spectroscopy. The types of ion motions in the fluoride and ammonium sublattices of both compounds have been determined in temperature range 150–450 K and their activation energy has been assessed. Phase transitions in compounds I and II has been revealed in temperature range 380–404 and 384–412 K to form high-temperature modifications with diffusion of fluoride and ammonium ions as the main type of ion motions. The high ionic conductivity of compounds I and II (higher 10–4 S/cm at 463 K) allows one to refer these fluoro complexes to the class of superionic conductors.
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