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Growth and Hydrogen uptake of Mg-Y thin films
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III. Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
Department of Physics and Materials Science, Physics III. Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
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2005 (English)In: Journal of Applied Physics, Vol. 97, 104903- p.Article in journal (Refereed) Published
Abstract [en]

Wedged Mg–Y films with compositions ranging from pure Mg to Mg0.83Y0.17 were grown by dc-magnetron sputtering and hydrogenated. Mg1–xYx forms a substitutional alloy, ranging from 0 to at least 17 at. % in thin films. The c lattice parameter of the film containing 17 at. % of yttrium is determined to be approximatively 1% larger than in pure Mg. Upon exposure to 1 bar of hydrogen at 300 K, the samples switch from shiny metals to colorless semiconductor. Different characteristic hydrogen depth distributions are found for different Y concentrations. At low yttrium contents, a large concentration gradient is observed, with the highest hydrogen concentration close to the Pd/Mg1–xYx interface. For yttrium concentrations larger than 7 at. %, the obtained hydrogen distribution is almost independent of depth. The optical band gap is determined to be 3.6 eV, for all the Y concentrations. The optical transmission is found to decrease for increasing Y content, which is associated with an incomplete hydride formation in the films.

Place, publisher, year, edition, pages
2005. Vol. 97, 104903- p.
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Inorganic Chemistry
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URN: urn:nbn:se:uu:diva-75903DOI: doi:10.1063/1.1896440OAI: oai:DiVA.org:uu-75903DiVA: diva2:103814
Available from: 2006-02-22 Created: 2006-02-22 Last updated: 2011-01-11

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Hjörvarsson, BjörgvinAndersson, Yvonne

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