Interaction of hydrogen with an Mg–Al alloy

The interaction of hydrogen with an Mg–Al alloy pre-exposed to air have been studied with in situ time resolved X-ray powder diffraction. Phase fractions as a function of time are derived from series of consecutive diffraction patterns allowing kinetic analysis. The apparent activation energy for de...

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Veröffentlicht in:	Journal of alloys and compounds 2005-12, Vol.404, p.323-326
Hauptverfasser:	Andreasen, A., Sørensen, M.B., Burkarl, R., Møller, B., Molenbroek, A.M., Pedersen, A.S., Andreasen, J.W., Nielsen, M.M., Jensen, T.R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Gas–solid reactions Hydrogen storage materials Intermetallics X-ray diffraction
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Zusammenfassung:	The interaction of hydrogen with an Mg–Al alloy pre-exposed to air have been studied with in situ time resolved X-ray powder diffraction. Phase fractions as a function of time are derived from series of consecutive diffraction patterns allowing kinetic analysis. The apparent activation energy for dehydrogenation of the Mg–Al alloy is found to be 160 kJ/mol. This is not significantly higher than for pure and fully activated Mg. It is suggested that the addition of Al improves the resistance towards oxygen contamination.
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2005.01.119