Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster session II

MM 26.11: Poster

Dienstag, 8. März 2016, 18:30–20:30, Poster B3

Electrochemical Hydrogenography on thin Magnesium films — •Niklas Teichmann, Magnus Hamm, Melissa Schenker, 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] This is the basic idea of the Hydrogenography where the change in the transistivity and reflectivity is measured to determine locally the Hydrogen concentration.[2] At room temperature the Mg-H system has a wide miscibiliy gap. This leads to a strong optical contrast.

In this paper, the optical change of thin Mg-films under hydrogen uptake is investigated using an electrochemical Hydrogenography technique.[3] By this, the MgH₂ formation can be measured and the formation kinetics can be studied.

As Mg oxidizes easily, oxides can be hardly prevented. In contact with hydrogen, hydroxides appear. These oxides and hydroxides directly influence the Hydrogen uptake and therefore, their impact is planned to be minimized.

Financial support by the DFG via projects PU131/9-2 and PU131/12-1 is gratefully acknowledged.

[1] T. Richardson et al. Applied Physics Letters 78.20 (2001): 3047-3049.

[2] R. Gremaud et al. Advanced Materials 19.19 (2007): 2813-2817.

[3] J. Kürschner et al. Journal of Alloys and Compounds 593 (2014): 87-92.