Transport Properties of Aliovalent Substitution Solid Solutions of the System (1-x)PbF2-A:YF3-SnF2

摘要

In polycrystalline solid solution of Pb_(1-x)Y_xSnF_(4+x) (0 < x < 0,17) with a structure of β-PbSnF4 in temperature 293 - 523 K the fluorine anions occupy three structurally nonequivalent positions which differ in the local environment and mobility. The concentration of mobility fluoride anions at 300 K is almost independent of the content of heterovalent substituent on YF3 and at temperatures above 430 K increases with grow concentration of the YF3. Fluoride ion exchange between nonequivalent subsystems increases with raising temperature, which causes an increase in conductivity. The electronic component of conductivity the synthesized samples by 2 orders of magnitude lower than the ion.