Regensburg 2016 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 14: Transport II: Atomic and ionic transport
MM 14.5: Talk
Monday, March 7, 2016, 17:00–17:15, H53
Transport of ions in a mixed Na+/K+ ion conducting glass - electrodiffusion profiles and electrochemical interphase formation — •Johannes Martin1, Sarah Mehrwald1, Martin Schäfer1, Thilo Kramer2, Christian Jooss2, and Karl-Michael Weitzel1 — 1Fachbereich Chemie, Philipps-Universität Marburg — 2Institut für Materialphysik, Universität Göttingen
The competition of Na+ ion versus K+ ion transport in a mixed alkali borosilicate glass has been investigated by low energy bombardment induced ion transport employing Cs+ ions as the foreign ion. Electro-diffusion causes the replacement of Na+ and K+ down to about 200 nm below the surface of the glass. Beyond this electrodiffusion front (in the direction of ion transport) K+ ions accumulate to a density above the bulk concentration while Na+ is further depleted towards the backward electrode. At the backward electrode only Na is electrodeposited since the electrical potential does not allow for K electrodeposition. A full simulation of the electrodiffusion profiles reveals the complete concentration dependence of the diffusion coefficients of the Na+ and K+ ions.