IONIC MOBILITY AND CONDUCTIVITY IN PbSnF4 DOPED WITH CaF2 FROM THE NMR AND IMPEDANCE SPECTROSCOPY DATA
V. Ya. Kavun1, N. F. Uvarov2, I. A. Telin1, M. M. Polyantsev1, A. B. Podgorbunskii1, O. V. Brovkina1, B. K. Goncharuk1
1Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia
2Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: кристаллические фазы в системе PbSnF, CaF, спектры ЯМР F, ионная подвижность, ионная проводимость, crystalline phases in the PbSnF-CaF system, F NMR spectra
, ionic mobility, ionic conductivity
Abstract
The ionic mobility and conductivity in the crystalline phases of PbSnF4- x CaF2 systems ( x = 2.5 mol.%, 5 mol.%, 7.5 mol.%, and 10 mol.%) in the temperature range of 150-500 K are studied by NMR and impedance spectroscopy. The parameters of 19F NMR spectra, types of ion motions, and ionic conductivity in the PbSnF4 compound doped with calcium fluoride are found to be determined by the temperature and concentration of calcium fluoride. The specific conductivity of the crystalline phases in the PbSnF4-CaF2 systems is rather high at room temperature, and hence, one cannot exclude the possibility to use them for the creation of functional materials with a high ionic (superionic) conductivity.
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