Ionic conductivity and diffusion in superionic conductors СuСrS <sub>2</sub> - АgСrS <sub>2</sub>
The dependence of the ionic conductivity of СuСrS 2, АgСrS 2 compounds and their alloys on temperature is measured. Structural studied carried out earlier showed that the Cu xAg 1-xCrS 2 alloys exist as a mixture of СuСrS 2 and АgСrS 2 phases at temperatures below 673 K and as a solid solution on the basis of a matrix structure at temperatures above 673 K. It is established that for all systems the activation energy for ionic conductivity has a jump at the phase transition point, which corresponds to the temperature of complete disordering of monovalent ionic sublattices. Chemical diffusion coefficients and ionic transport numbers for all tested compounds were determined from the build-up and decay curves of concentration polarization.