The mixed mobile ion effect was investigated for the first time in zinc fluoride glasses where in addition to alkali cations fluorine anions also participate in the diffusion process, unlike mixed alkali oxide glasses. The minimum in the conductivity, conductivity relaxation frequency, crossover frequency and decoupling index indicated the existence of the mixed mobile ion effect in these fluoride glasses. It was observed that the non-exponential parameter and the frequency exponent were independent of temperature. It was established that alkali ions and fluorine anions exhibit lower dimensionality of the conduction pathways in mixed alkali zinc fluoride glasses than that in the single alkali lithium based zinc fluoride glasses while they were migrating. From the scaling of the conductivity spectra, it was established that the relaxation dynamics in mixed alkali zinc fluoride glasses was independent of temperature and composition.

Mixed Mobile Ion Effect in Fluorozincate Glasses. S.Ghosh, A.Ghosh: Journal of Physics - Condensed Matter, 2005, 17[23], 3463-72