Abstract
Ion mobility, phase transitions (PT), and conductivity in compounds (NH4)6RbZr4F23 (I) and (NH4)6RbHf4F23 (II) were studied by 1H and 19F NMR spectroscopy, X-ray powder diffraction (XRD), DSC, and impedance spectroscopy. Ion movement modes in fluoride and ammonium sublattices of both compounds were determined in temperature range 150–480 K and their activation energy was assessed. Phase transitions in compounds I and II were revealed in temperature ranges 400–440 and 419–440 K resulting in formation of α modifications where diffusion of fluoride and ammonium ions becomes the dominant kind of ion movement. High ionic conductivity in fluoride II (σ ~ 7.7 × 10–3 S/cm at 463 K) indicates that this compound belongs to the class of superionic conductors.
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