Regensburg 2019 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 14: Poster
DS 14.48: Poster
Dienstag, 2. April 2019, 17:00–20:00, Poster E
Investigation of Hydrogen Gas Sorption in Thin Metal Films Using a Quartz Crystal Micro Balance — •Sonja Schneidewind1, Julian Blaschtschak1, Max Aker1, Andreas Fleischmann2, Loredana Gastaldo2, Andreas Reifenberger2, and Magnus Schlösser1 — 1ITEP, KIT, Karlsruhe, Germany — 2Kirchhoff-Institut für Physik, Heidelberg, Germany
Certain metals have the ability to solve hydrogen in their lattice structure and to subsequently form metal hydrides. Out of these materials, titanium has one of the lowest dissociation pressure which allows a quasi-irreversible hydrogen capture. However, the titanium surface tends to form an oxide layer at contact with air which acts as effective permeation barrier. The oxidation can be prevented by sputtering a thin palladium film on top allowing the hydrogen permeation through the Pd layer into the Ti getter. This technique can be used to build effective passive hydrogen pumps or by employing the radioactive isotopologue, tritium, one can build dedicated radioisotope heat sources, e.g. for calibration purposes.
In order to study kinetics, materials and loading parameters, we perform sorption experiments by using a high-resolution quartz crystal micro balance with deuterium at the ng scale. As an additional testing method, AFM and XRD are used to get information about the film structure and to verify the absorbed gas amount. Finally, the findings will be applied to a dedicated loading of identical metal films with tritium gas which will then be validated by Beta-Induced X-Ray Spectroscopy.