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Structural evolution of Pd-capped Mg thin films under H 2 absorption and desorption cycles
Ist Teil von
International journal of hydrogen energy, 2009-06, Vol.34 (11), p.4817-4826
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2009
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
In this paper we present a study on the relation between the evolution, upon successive H
2 cycling, of the crystalline order and the H
2 sorption properties of Pd-capped textured Mg thin films grown on Si and glass substrates.
Using an asymmetric diffraction geometry suitable for thin films, it is found that: i) hydrogen desorption can be achieved at low temperatures exposing the samples to air and ii) already upon one hydrogen absorption–desorption cycle, the original texture is lost. Moreover metal-to-insulator transition following magnesium hydride formation is observed through spectrophotometry. However, cycling results in being detrimental to film properties, mainly due to the Pd cap degradation and correlated processes.