The ionic mobility and electrical conductivity in solid solutions with the fluorite stricture obtained by the solid phase method in the system PbF2-SnF2-SbF3 with composition close to PbSnF4 have been investigated using the methods of F-19 NMR and impedance spectroscopy. It has been established that parameters of F-19 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 beta-PbSnF4. It suggests that fluorite phase in solid solutions under study is metastable and formed by elementary fluorite-type blocks typical of the structure of beta-PbSnF4. Introduction of Sb3+ into the structure leads to decrease in the conductivity. Nevertheless, the specific conductivity of solid solutions in the system and PbF2 SnF2 SbF3 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. (C) 2017 Published by Elsevier B.V.