Conductivity of non-stoichiometric fluoride-conducting phases Ba0.9–xLaxSn1.1F4+x

Fluoride-conducting phases Вa0.9–xLaxSn1.10F4+x (х0.12), formed by the partial substitution of barium cations with lanthanum cations in the initial non-stoichiometric phase Вa1–xLaxF2+x (х0.12), crystallize in a tetragonal syngony (P4/nmm) isotypic to BaSnF4. The conductivity of the synthesized phases is higher than that of the parent compound and increases with temperature and substituent concentration. The highest conductivity is observed in the Ba0.78Lа0.12Sn1.10F4.12 phase, where fluoride anions are the primary charge carriers. The activation energy of conductivity decreases with increasing substituent content, which is characteristic of both high- and low-temperature regions. The synthesized fluoride-conducting phases remain stable within the potential range of –1.5 to +1.9 V.