Fast interfacial ionic conduction in nanostructured glass ceramics |
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Authors: | Schirmeisen André Taskiran Ahmet Fuchs Harald Bracht Hartmut Murugavel Sevi Roling Bernhard |
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Affiliation: | Center for Nanotechnology (CeNTech), Westf?lische Wilhelms-Universit?t Münster, Heisenbergstrasse 11, 48149 Münster, Germany. schirmeisen@uni-muenster.de |
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Abstract: | The hopping movements of mobile ions in a nanostructured LiAlSiO4 glass ceramic are characterized by time-domain electrostatic force spectroscopy (TDEFS). While the macroscopic conductivity spectra are governed by a single activation energy, the nanoscopic TDEFS measurements reveal three different dynamic processes with distinct activation energies. Apart from the ion transport processes in the glassy and crystalline phases, we identify a third process with a very low activation energy, which is assigned to ionic movements at the interfaces between the crystallites and glassy phase. Such interfacial processes are believed to play a key role for obtaining high ionic conductivities in nanostructured solid electrolytes. |
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