| Autor: |
Andreasen, A., Sørensen, M. B., Burkarl, R., Møller, B., Molenbroek, A. M., Pedersen, A. S., Vegge, T., Jensen, T. R. |
| Předmět: |
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| Zdroj: |
Applied Physics A: Materials Science & Processing; Mar2006, Vol. 82 Issue 3, p515-521, 7p, 1 Diagram, 1 Chart, 7 Graphs |
| Abstrakt: |
The dehydrogenation kinetics of air exposed samples of MgH2/Mg2Cu and MgH2/MgCu2 have been studied with in situ time resolved X-ray powder diffraction. The X-ray setup enabled the recording of full diffraction patterns within 150 s, thereby allowing the study of structural changes combined with simultaneous extraction of kinetic parameters. Phase fractions as a function of time and temperature were derived from series of consecutive diffraction patterns by numerical integration of selected diffraction peaks. The apparent activation energy for the dehydrogenation of the MgH2/Mg2Cu, and MgH2/MgCu2 sample was found to be 108 kJ/mol and 160 kJ/mol, respectively. Furthermore, substantially improved dehydrogenation kinetics of MgH2 and resistance towards oxidation of Mg due to the presence of Mg2Cu/MgCu2 are discussed in relation to previous work. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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