Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 23: Charged Soft Matter

CPP 23.1: Vortrag

Dienstag, 8. März 2016, 14:00–14:15, H40

Ionic conductivity of plastic crystals — •Daniel Reuter, Korbinian Geirhos, Peter Lunkenheimer, and Alois Loidl — Experimental Physics V, University of Augsburg, Germany

Regarding the challenges of storing solar and wind energy or of electro mobility, the development of new solid-state electrolytes is often seen as a promising way to achieve further advances [1]. However, the development of a solid electrolyte with conductivity comparable to that of liquid electrolytes and mechanical properties of a solid is still in progress. There is a whole class of materials naturally combining properties of liquid and solid matter, namely the plastic crystals (PC). Below a certain transition temperature, the molecules of these materials form a well-defined crystalline lattice but still retain their orientational degrees of freedom. This feature of freely rotating molecules ordered in a crystalline structure is believed to enhance the mobility of dissolved ions in the material [2]. Remarkably, by adding a second component to one of the most prominent ionically conducting PCs, succinonitrile, an increase of the conductivity over several decades was found [3]. Therefore dielectric spectroscopy being sensitive to both molecular motion and ionic conductivity was applied to various molecular compositions of two-component PCs. We aim at answering the question if either the possible "revolving door" mechanism or defects in the lattice structure govern the high ionic charge mobility in these binary PC systems.
J. Motavalli, Nature 526, 96 (2015). [2] P. Alarco et al., Nature 3, 476 (2004). [3] K. Geirhos et al., J. Chem. Phys. 143, 081101 (2015).