Significance of activation volumes for cation transport in glassy electrolytes
Literature Information
Malcolm D. Ingram, Corrie. T. Imrie, Ioannis Konidakis, Stephan Voss
A new model is described for cation transport in glass, in which below Tg a dynamic equilibrium exists between ‘open’ and ‘closed’ sites. Cations migrate by hopping into a relatively small number of open sites, which must be just the right size for them to occupy. This model accounts plausibly for the apparent constancy of activation volumes (−RTdlnσ/dP) in single cation glasses, since the activation volumes are identified with the volumes of the open sites. The effect of increasing the external pressure is to close off some of these sites, thus reducing the number of ions which are free to move. This new approach draws emphasis away from the nature of ‘occupied’ to ‘unoccupied’ sites in glass; in this sense it is consistent with the ‘dynamic structure model’ proposed by Bunde et al.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.











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