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Decoupling Mobility and Charge Carrier Concentration in Agr-agpo3 Glasses (R = Cl, Br, I)

submitted on 26.10.2018, 04:27 and posted on 29.10.2018, 14:27 by Bruno Poletto Rodrigues, Heike Ebendorff-Heidepriem, Lothar Wondraczek
Halide-containing silver phosphate glasses have been used as model systems for the study of the ionic conductivity of oxide glasses for the past 50 years, mostly due to the massive increase in conductivity observed as the halide concentration is increased, even if the molar ratio of silver is kept constant. Furthermore there is still no consensus if the increased conductivity is due to an enhancement of the number of effective charge carriers (glass as a weak electrolyte) or a higher charge carrier mobility (glass as a strong electrolyte). In this work we investigate the electrical properties of silver-halide-containing silver metaphosphate glasses through Impedance Spectroscopy. We find the glasses to follow the “canonical scaling”, which coupled with the diffusional nature of the conductivity allows us to show that the number of effective charge carriers remains constant with increasing halide concentration, and that the conductivity follows the same scaling as the ionic mobility.


The financial support of the German Science Foundation through its priority program SPP 1594 (project number WO 1220/10-1), the European Research Council under the EU’s Horizon 2020 research and innovation program (ERC grant UTOPES, grant agreement number 681652), and the Australian Research Council (grant number DP170104367)


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No conflict of interest