Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 20: Glasses III (joint session DF/DY)

DY 20.1: Vortrag

Mittwoch, 27. Februar 2008, 14:30–14:45, EB 407

Impedance- and IR-spectroscopy on sputtered borate glasses — •Gerd-Hendrik Greiwe and Guido Schmitz — Institut für Materialphysik, WWU Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster

Ion-conducting oxide glasses are considered as components of thin film batteries. In our study, glass films of the compositions x Li₂O · (1−x) B₂O₃ with x = 0.15, 0.20, 0.25, 0.30, and 0.35 are prepared by ion beam sputtering in a thickness range between 100 and 1000 nm. TEM cross section investigations show a homogeneous, amorphous structure of the films, while the correspondence of their chemical composition with the glass targets is proved by EELS analysis. The specific dc-conductivity of the glass films is determined by temperature-dependent impedance spectroscopy and found to be up to three orders of magnitude higher compared to the conductiviy of the corresponding bulk glasses prepared from the melt. This conductivity increase is explained by a modification of the network structure of the thin glass films. The concentration of the Non-Bridging Oxygen atoms of the network is assumed to be increased by the sputter process. This increase is expected to be the main reason for the observed conductivity enhancement. IR-spectroscopy is used to determine the content of the Non-Bridging Oxyges atoms of the network, to correlate structural and electrical properties of the thin film glasses.