Abstract

The mixed mobile ion effect has been investigated for the first time in zinc fluoride glasseswhere in addition to alkali cations fluorine anions also participate in the diffusion process,unlike mixed alkali oxide glasses. The minimum in the conductivity, conductivity relaxationfrequency, crossover frequency and decoupling index indicates the existence of the mixedmobile ion effect in these fluoride glasses. It has been observed that the non-exponentialparameter and the frequency exponent are independent of temperature. It has beenestablished that alkali ions and fluorine anions exhibit lower dimensionality of theconduction pathways in mixed alkali zinc fluoride glasses than that in the single alkalilithium based zinc fluoride glasses while they are migrating. From the scaling of theconductivity spectra, it has been established that the relaxation dynamics inmixed alkali zinc fluoride glasses is independent of temperature and composition.

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