Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20031
Title: Elemental and phase composition analysis of hydrogen-sensitive Pd/Mg-Ni films
Authors: Tang, YM
Ong, CW 
Issue Date: 2008
Publisher: Springer
Source: Applied physics. A, Materials science & processing, 2008, v. 91, no. 4, p. 701-706 How to cite?
Journal: Applied physics. A, Materials science & processing 
Abstract: A magnesium-nickel (Mg-Ni) film with a palladium (Pd) overcoat is switchable between a conducting metallic state and a semiconducting state through hydridation and dehydridation processes. The Pd overcoat is added to suppress possible oxidation of the alloy layer. However, some Pd and oxygen (O) atoms are still able to diffuse into the alloy layer, such that the distributions of elemental and phase compositions along the direction of depth are quite complicated. In this work, we propose a method to obtain more detailed information on the elemental and phase compositions in a Pd/Mg-Ni film by means of analyzing Pd 3d5/2, Pd 3p3/2, Ni 2p3/2, Mg 1s and O 1s photoelectron spectra. The method was applied to analyze a typical Pd/Mg-Ni film sample. Results verified that Pd can diffuse into the alloy layer. An Mg-O phase is formed near the surface. An Mg-Ni alloy phase dominates at deeper regions. The Mg-Ni phase contains 80% of the total number of atoms in the film, and is non-stoichiometric and highly disordered. Nevertheless, it can give a remarkable change of electrical resistivity during hydridation- dehydridation processes.
URI: http://hdl.handle.net/10397/20031
ISSN: 0947-8396
EISSN: 1432-0630
DOI: 10.1007/s00339-008-4508-0
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