Phase transitions, ion mobility, and conductivity in fluoro complexes (NH4)6RbZr4F23 and (NH4)6RbHf4F23

Ion mobility, phase transitions (PT), and conductivity in compounds (NH 4 ) 6 RbZr 4 F 23 ( I ) and (NH 4 ) 6 RbHf 4 F 23 ( II ) were studied by 1 H and 19 F NMR spectroscopy, X-ray powder diffraction (XRD), DSC, and impedance spectroscopy. Ion movement modes in fluoride and ammonium sublattices of...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2016-06, Vol.61 (6), p.740-749
Main Authors: Kavun, V. Ya, Antokhina, T. F., Savchenko, N. N., Podgorbunskii, A. B., Kaidalova, T. A.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Physical Methods of Investigation
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Summary:Ion mobility, phase transitions (PT), and conductivity in compounds (NH 4 ) 6 RbZr 4 F 23 ( I ) and (NH 4 ) 6 RbHf 4 F 23 ( II ) were studied by 1 H and 19 F 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.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023616060115