Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 82: Glasses and Glass Transition (joint session DY/CPP)

DY 82.10: Vortrag

Freitag, 16. März 2018, 12:30–12:45, BH-N 334

Site energy distributions in ion conducting glasses — •Martin Schäfer and Karl-Michael Weitzel — Philipps-Universität Marburg, Marburg, Germany

In a crystalline sample of an ion-conducting material all ions exhibit the same surrounding and thus the same site energy. In an ion-conducting glass ions exhibit different local surroundings. Thus, a distribution of site energies will apply. So far all information on such site energy distributions appears to either come from theory or indirect experiments. This site energy distribution is evidently crucial for all transport processes involving the transport of considerable fractions of mobile ions, e.g. in battery materials. Consequently, direct information on this energy distribution best comes from an experiment, where all ions of a certain kind are almost completely depleted, e.g. by a foreign ion. By reanalysis of previously published concentration depletion profiles within the foreign ion bombardment induced ion transport [1] we are now able to derive the complete site energy distribution of sodium ions in a calcium-sodium-phosphate glass. The occupied part of the site energy distribution spans a width of about 0.28 eV FWHM [2].

[1]*L. Rossrucker, P.V. Menezes, J. Zakel, M. Schäfer, B. Roling and K.-M. Weitzel, Zeitschrift für Physikalische Chemie, 226, 341-353, (2012).

[2]*M. Schäfer, K.-M. Weitzel, to be submitted