PHASE TRANSITIONS AND IONIC MOBILITY IN SOLID SOLUTIONS IN THE BiF3в€’KFв€’ZrF4 SYSTEM
V. Ya. Kavun, E. B. Merkulov, M. M. Polyantsev, R. M. Yaroshenko, V. K. Goncharuk
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia
Keywords: твердые растворы с флюоритовой структурой, ионная подвижность, фазовые переходы, спектры ЯМР 19F, спектры ДСК, рентгенофазовый анализ, solid solutions with a fluorite structure, ionic mobility, phase transitions, 19F NMR spectra, DSC spectra, X-ray crystallographic analysis
Abstract
The phase transitions and ionic mobility in solid solutions (SS) with the fluorite structure ((100−х)KBiF4−xZrF4, where х = 2.5−10 mol.%) are studied by DSC, X-ray crystallographic analysis, and 19F NMR methods. Phase transitions are determined in the solid solutions containing 10% of ZrF4. The types of ion motions in the SS fluoride sublattice and the corresponding temperature ranges (150−570 K) are determined. A high ionic conductivity in these solid solutions (~10-3−10-2 S/cm in the temperature range from 475 K to 550 K) is established, this fact not excluding the possibilities to use them for the production of materials with high ion conductive properties.
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