Regensburg 2007 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 17: Glass II (joint session with DF)
DY 17.4: Talk
Tuesday, March 27, 2007, 15:30–15:50, H23
Evidence for fast interfacial ion conduction in nanostructured solid electrolytes — •Ahmet Taskiran1, Andre Schirmeisen1, Harald Fuchs1, Hartmut Bracht2, and Bernhard Roling3 — 1Physikalisches Institut,Wilhelm-Klemm-Str.10,48149 Münster,Germany — 2Institut für Materialphysik,Wilhelm-Klemm-Str.10,48149 Münster,Germany — 3Intsitut für Physikalische Chemie,Hans-Meerwein-Str.,35032 Marburg,Germany
Solid ion conductors are used for applications like super-capacitors, high storage batteries and chemical sensors. Recent investigations have revealed that the overall conductivity can be enhanced by creating interfaces between different phases of the ion conductor. However, more detailed investigations have to be carried out on the nanoscopic length scale in order to understand the ion transport mechanism in the bulk and at the interface. We use electrostatic force microscopy (EFM) operating in the non-contact mode to measure the ionic conductivity in nanoscale volumes. In this method the temperature dependent ion conductivity was monitored in the range from 100 K to 675 K, yielding the activation energies of the ion hopping processes [1]. This work mainly focuses on the interfacial conductivity between the nanocrystallites and the glass phases of a partially crystal. LiAlSiO sample. Additionally to the activation energies found for the nanocrystallites and glass phase, which are in good agreement with macroscopic results [2], we identified a third activation energy, which can be attributed to the interfacial ion conductivity. [1] Schirmeisen et al., Appl. Phys. Lett. 85(2004)2053 [2] Roling et al., Phys.Chem.Chem.Phys. 7(2005)1472