Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 40: SYM Hydrogen in Materials: New Developments IV

MM 40.3: Vortrag

Donnerstag, 28. Februar 2008, 17:20–17:40, H 1058

Seeing Hydrogen — •Andreas Borgschulte — EMPA Materials Science and Technology, Hydrogen & Energy, Überlandstrasse 129, CH-8600 Switzerland

The fact that hydrogen absorption in metals leads to large optical changes is the basis of a new combinatorial method called hydrogenography. We show that hydrogenography provides a high-throughput method to measure quantitatively the key thermodynamic properties (equilibrium properties like heat of absorption and kinetics) of hydride formation. The optical setup involves a good accessibility of the sample, which enables us the measurement of the impact of electric fields on the hydrogen absorption process. We demonstrate that an electric current and the thereby induced heat and electromigration of H⁻ ions can start and control the absorption of hydrogen in Mg thin films. We describe how the optical technique on thin films can be transferred to measure hydrogen dynamics in bulk materials by means of Raman spectroscopy.