Transport properties of solid solutions PbF2–SnF2–SbF3 prepared by solid state techniques

Abstract The ionic mobility and electrical conductivity in solid solutions with the fluorite structure obtained by the solid-phase method in the system PbF 2 –SnF 2 –SbF 3 with composition close to PbSnF 4 have been investigated using the methods of 19 F NMR and impedance spectroscopy. It has been established that parameters of 19 F NMR spectra, types of ionic motions in the fluoride sublattice and the value of ionic conductivity are determined by temperature and the composition of the solid solutions. Transport properties of solid solutions under study are similar to those of tetragonal phase β-PbSnF 4 . It suggests that fluorite phase in solid solutions under study is metastable and formed by elementary fluorite-type blocks typical of the structure of β-PbSnF 4 . Introduction of Sb 3 + into the structure leads to decrease in the conductivity. Nevertheless, the specific conductivity of solid solutions in the system and PbF 2 –SnF 2 –SbF 3 at 400 K attains the values of 10 − 2 –10 − 3  S/cm, which enables one to consider them as promising materials for electrochemical applications.