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Ion transport at interfaces: an ac conductivity study on glass ceramics containing nanocrystallites

We have studied the ac ionic conductivity of Ag 8 I 4 V 2 O 7 glass and glass ceramics at different stages of the crystallisation process. In the early stages of this process, the formation of nanocrystallites leads to an enhancement of the ionic conductivity, which is related to the large interface area between the nanocrystallites and the glassy phase. We use a brick layer model to separate and compare the bulk and the interfacial contributions to the ac conductivity spectra of the glass ceramic with the maximal conductivity, and we find that the ionic mobility at the interfaces is about two to three orders of magnitude larger than in the bulk. The spectral shape of the interfacial contribution to the ac conductivity is similar to the bulk contribution, but the interfacial contribution is characterised by a larger mean square displacement of the mobile ions at the crossover from subdiffusive dynamics to diffusive dynamics, c r .