Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.22: Poster

Dienstag, 21. März 2017, 18:30–20:30, P4

Lateral H-Diffusion in Mg thin films — •Niklas Teichmann, Magnus Hamm, and Astrid Pundt — Univ. Göttingen, IMP, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Hydrogen in metals like Magnesium changes the physical properties of the host material, such as the optical properties.[1] The optical light transmission can be used to determine locally the Hydrogen content, or to differentiate between phases (Hydrogenography).[2] For the Mg-H system, two phases are relevant at 300 K: the metallic α-phase and the transparent MgH₂-phase.
In this presentation, the hydrogen-induced optical change of thin Mg-films is investigated using electrochemical loading via a Pd-gate.[3] By this, the lateral diffusion and the MgH₂ formation can be directly seen and the formation kinetics can be studied. The influence of grain boundaries is discussed.
Financial support by the DFG via projects PU131/9-2 and PU131/10-2 is gratefully acknowledged.
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