The hopping of mobile ions in a nanostructured LiAlSiO4 glass ceramic was characterized by using time-domain electrostatic force spectroscopy. It was found that, whereas the macroscopic conductivity spectra were governed by a single activation energy, the nanoscopic time-domain electrostatic force spectroscopic measurements revealed 3 different dynamic processes having distinct activation energies. Apart from ion-transport processes in the glassy and crystalline phases, a third process was identified (having a very low activation energy) which was attributed to ionic movements at the interfaces between the crystallites and the glassy phase. Such interfacial processes were suggested to play a key role in obtaining high ionic conductivities in nanostructured solid electrolytes.
Fast Interfacial Ionic Conduction in Nanostructured Glass Ceramics. A.Schirmeisen, A.Taskiran, H.Fuchs, H.Bracht, S.Murugavel, B.Roling: Physical Review Letters, 2007, 98, 225901 (3pp)