Phase Relations, Ionic Transport and Diffusion in the Alloys of Cu2S-Ag2S Mixed Conductors

Results are reported of the phase relations in the (Agx-delta/2Cu1-x)(2)S system, ionic conductivity, self-diffusion and chemical diffusion coefficients for the solid solutions as a function of the composition x, degree of non-stoichiometry delta, and temperature in the range 473 - 673 K. The extensions of the homogeneity regions for single-phases are determined. Total and partial ionic conductivity values are given for copper and silver ions for the solid solutions. Measurements of the self-diffusion coefficient and the correlation factors are reported. It is shown that for solid solutions that the chemical diffusion is well described in terms of the phenomenological theory of ionic transport in mixed ionic electronic conductors.