High ionic conductivity in new fluorine compounds of tin II. II. On the binary system PbF2-SnF2

Abstract The Pb x Sn 1− x F 2 solid solutions adopt various structural types following the x value. We observed an evolution from a completely disordered structure for the phases with high lead concentration to an ordered structure for x =0.5. The increase of the logarithm of the conductivity with x is explained by the increase of the number of vacancies in normal anionic positions when the ratio of Sn 2+ Pb 2+ is increasing.