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Structural evolution of Pd-capped Mg thin films under H sub(2 absorption and desorption cycles)
Ist Teil von
International journal of hydrogen energy, 2009-06, Vol.34 (11), p.4817-4826
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 sub(2 cycling, of the crystalline order and the H) sub(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.