Ion-transport properties of composites based on tin and lead difluorides according to 19F NMR data

Abstract

The ¹⁹F NMR method was used to study ionic motions in eutectic composites of the composition 90SnF₂-10PbF₂ obtained by various methods, PbSnF₄ and the metastable fluorite phase 84SnF₂-16PbF₂. It was found that the shape of the ¹⁹F NMR spectra of all samples and the nature of their temperature transformations are similar. The activation energy of ionic motions in the composites depends on the method of their preparation. The crystalline samples and the composite obtained by long-term sintering had the lowest activation energy. The ionic electrical conductivity of the samples exceeds 10^–3 S/cm at 400 K.