The ionic conductivity increased monotonically, by 4 orders of magnitude, from 3 x 10−8 to 5 x 10−4S/cm when CuI was gradually replaced by AgI; with no minimum at intermediate concentrations. No diffusivity cross-over was observed. The 110Ag tracer diffusion coefficient, DAg, parallelled the conductivity isotherm; with almost the same change in DAg, of 4 orders of magnitude, from about 10−12 to about 10−8cm2/s. The values of DCu were always lower than those of DAg. An exception was 0.5CuI-0.5As2Se3 glass, where DAg and DCu were very similar. The results were explained in terms of a degenerate mixed-cation effect, with different trends for Ag and Cu mobile cations.

Degenerate Mixed Cation Effect in CuI–AgI–As2Se3 Glasses - 64Cu and 110Ag Tracer Diffusion Studies. A.Bolotov, E.Bychkov, Y.Gavrilov, Y.Grushko, A.Pradel, M.Ribes, V.Tsegelnik, Y.Vlasov: Solid State Ionics, 1998, 113-115, 697-701