Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1627079 | Journal of Alloys and Compounds | 2007 | 7 Pages |
Abstract
The mixtures of commercial SrH2 and Al powders were ball milled under hydrogen at a rotation speed of 150Â rpm for different time. The ball milled products could not be further hydrogenated to Sr2AlH7. In the case of ball milling of Sr2Al alloy under hydrogen at a rotation speed of 150Â rpm for 10Â h, however, the milled product consisting of SrH2 and Al can be easily hydrogenated to the Sr2AlH7 hydride at 533Â K for 2 days. SEM and TEM observations demonstrated that the Al particles in the ball milled 2SrH2Â +Â Al mixtures were agglomerative and the average size of the Al particles was of the order of 100Â nm. In the ball milled Sr2Al alloy, however, the Al particles were dispersive and the average particle size was about 10Â nm. The different microstructures were considered to be the most important factor in affecting the kinetics of hydrogenation reaction, which is the reason for the distinct hydrogenation characteristics.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Q.A. Zhang, H. Enoki, E. Akiba,