Thermal and physical properties of an archetypal organic ionic plastic crystal electrolyte
Literature Information
Steven J. Pas, Jennifer M. Pringle, Maria Forsyth, Douglas R. MacFarlane
The thermal and mechanical properties of the ionic plastic crystal N-methyl-N-propylpyrrolidinium hexafluorophosphate have been investigated and the effect of adding a miscible polymer on the mechanical properties is reported. The physical properties of the pure plastic crystal are discussed in detail and for the first time the change in volume with temperature for an organic ionic plastic crystal is reported. An increase in volume in conjunction with increased conductivity supports the hypothesis that ion conduction within the plastic crystal proceeds via defects. For phase I and melting, the magnitude of the volume increase does not appear to be in accord with the subtle change in conductivity. This is suggested to be due to the presence of layer defects, which allow for correlated ionic motion, which does not increase the conductivity. Addition of polymer to the plastic crystal significantly increases the mechanical strength, decreases the conductivity, but has little effect on the phase behaviour, further supporting the hypothesis of vacancy-mediated conduction.
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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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