Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Poster Session
MM 15.34: Poster
Montag, 11. März 2013, 18:00–20:00, Poster E
Electrochemical Hydrogenography of Palladium, Magnesium and Titanium — •Jara Kürschner and Astrid Pundt — Institut für Materialphysik, Universität Göttingen, Germany
The storage of hydrogen in metals is a safe and volumetrically desirable way. Rapid determination of the hydrogen concentration cH in gas-phase loaded metal thin films can either be done by resistivity or transmission measurements as the electronic structure of the metal changes during hydrogenation. Since some years, the optical transmission T is applied in a technique named "Hydrogenography" to determine the hydrogen concentration in thin alloy films. A linear relationship cH ∝ ln (T/TMetal), as predicted by the Lambert-Beer law, is commonly assumed although it holds the assumption of the free lattice gas model.
The model does neither imply non-homogeneous hydrogen distributions as occurring during phase transitions of many metal-hydrogen systems, nor stresses, plastic deformation and film buckling which are often arising in clamped thin films.
This study analyzes the dependency between optical transmission and hydrogen concentration for clamped and quasi-free palladium, magnesium and titanium thin films. Via electrochemical hydrogen loading, the hydrogen concentration is independently controlled and the applicability of the Lambert-Beer law can be tested.
Financial support by the DFG via PU131/9 and PU131/10 is gratefully acknowledged.