Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Postersession I
MM 17.4: Poster
Montag, 16. März 2015, 18:00–20:00, Poster E
H-Diffusion in Mg-Fe11at% Alloys — •Magnus Hamm, Helmut Uchida, and Astrid Pundt — Universität Göttingen, IMP, Friedrich-Hund-Platz 1, 37077 Göttingen
In the last decade Magnesium (Mg) has attracted much interest as a storage material for hydrogen. The reasons are its high reversible hydrogen capacity of up to 7,6 wt% and its high volumetric capacity of 110 kg/m3 [1]. However the slow hydrogen (de)absorbtion kinetics of Mg and its high desorption temperature provide a significant barrier to Magnesium’s commercial use [2]. Iron (Fe) is known to improve the hydrogen uptake rate in Mg [3]. To study the influence of Fe on the kinetics of Mg, 500 nm Mg-Fe alloy films were prepared by Argon-ion-beam sputtering and loaded from the gas phase. The hydrogen uptake was studied in-situ with synchrotron radiation at DESY/Hamburg and ESRF/Grenoble. It will be demonstrated that the diffusion constant, while lower than in pure Magnesium, was orders of magnitude above the recorded diffusion constant of MgH2. In addition, with the used parameters full loading of the Mg-Fe samples is possible without any sign of a blocking layer. This differs strongly to what was found by H. Uchida et al.[4] on pure Mg films of similar thickness.
Beamtime provided at the DESY/Hamburg and the ESRF/Grenoble is gratefully acknowledged. This project is financially supported by the DFG via Project PU131/9-1 and PU131/10-1.
[1] Dornheim, R. et al., Scr. Mat. 56:10 (2007) [2] Bogdanović, B. et al., J. Alloys Compd. 282:1-2 (1999) [3] Holtz, R.L. and Imam, M.A., J. Mater. Sci. 34:11 (1999) [4] Uchida, H. et al., Acta Mat., accepted