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DY: Dynamik und Statistische Physik
DY 28: Glass I (joint session with DF)
DY 28.2: Vortrag
Dienstag, 28. März 2006, 10:10–10:30, M{\"U}L Elch
Nanostructured Solid Electrolytes analyzed by Time-Domain Electostatic Force Spectroscopy — •Ahmet Taskiran1, Andre Schirmeisen1, Harald Fuchs1, Bernhard Roling2, Hartmut Bracht3, Frank Natrup2, and Sevi Murugavel2 — 1Physikalisches Institut, Wilhelm-Klemm-Str.10, 48149 Münster, Gemany — 2Institut für Physikalische Chemie, Corrensstr..30, 48149 Münster, Gemany — 3Institut für Materialphysik, Wilhelm-Klemm-Str.10, 48149 Münster, Gemany
Ion conducting solid materials are widely used as solid electrolytes in, e.g,. batteries. An important prerequisite for further progress in this field is a better understanding of ion transport mechanisms on nanoscopic length scales. We are using an atomic force microscope (AFM) operated in the non-contact mode for electrostatic force spectroscopy to measure the ion conductivity in nanoscale volumes of homogeneous and heterogeneous solid electrolytes. The measurements are carried out at sample temperatures ranging from 200 K to 675 K and at different positions on the sample. The relaxation times at different temperatures follow the Arrhenius model,which yield the activation energy of the ion hopping processes [1]. Furthermore the local variation of the relaxation strength provides us with information on the different phases and interfaces in the sample. In our work we focus on nanostructured solid electrolytes. We find that the activation energies for the ions in the nanocrystallites and in the glass regions are different, in agreement with macroscopic results [2]. [1] Schirmeisen et al., Appl.Phys.Lett. 85,2053 [2] Roling et al., Phys.Chem.Chem.Phys. 7,1472