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Mg/Ti multilayers :
Mg/Ti multilayers : Structural and hydrogen absorption properties
- Article/chapterEnglish2010
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LIBRIS-ID:oai:DiVA.org:uu-135537
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-135537URI
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https://doi.org/10.1103/PhysRevB.81.224203DOI
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Language:English
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Summary in:English
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Mg-Ti alloys have uncommon optical and hydrogen absorbing properties, originating from a "spinodal-like" microstructure with a small degree of chemical short-range order in the atomic distribution. In the present study we artificially engineer short-range order by depositing Pd-capped Mg/Ti multilayers with different periodicities. Notwithstanding the large lattice mismatch between Mg and Ti, the as-deposited metallic multilayers show good structural coherence. On exposure to H-2 gas a two-step hydrogenation process occurs with the Ti layers forming the hydride before Mg. From in situ measurements of the bilayer thickness Lambda at different hydrogen pressures, we observe large out-of-plane expansions of Mg and Ti layers on hydrogenation, indicating strong plastic deformations in the films and a consequent shortening of the coherence length. On unloading at room temperature in air, hydrogen atoms remain trapped in the Ti layers due to kinetic constraints. Such loading/unloading sequence can be explained in terms of the different thermodynamic properties of hydrogen in Mg and Ti, as shown by diffusion calculations on a model multilayered systems. Absorption isotherms measured by hydrogenography can be interpreted as a result of the elastic clamping arising from strongly bonded Mg/Pd and broken Mg/Ti interfaces.
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Pálsson, Gunnar K.Uppsala universitet,Materialfysik(Swepub:uu)gukpa839
(author)
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Gonzalez-Silveira, M.
(author)
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Schreuders, H.
(author)
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Slaman, M.
(author)
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Rector, J. H.
(author)
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Krishnan, G.
(author)
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Kooi, B. J.
(author)
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Walker, G. S.
(author)
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Fay, M. W.
(author)
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Hjörvarsson, BjörgvinUppsala universitet,Materialfysik(Swepub:uu)bjorghvs
(author)
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Wijngaarden, R. J.
(author)
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Dam, B.
(author)
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Griessen, R.
(author)
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Uppsala universitetMaterialfysik
(creator_code:org_t)
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In:Physical Review B. Condensed Matter and Materials Physics81:22, s. 224203-1098-01211550-235X
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Baldi, A.
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Pálsson, Gunnar ...
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Gonzalez-Silveir ...
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Schreuders, H.
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Slaman, M.
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Rector, J. H.
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Krishnan, G.
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Kooi, B. J.
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Walker, G. S.
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Fay, M. W.
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Hjörvarsson, Bjö ...
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Wijngaarden, R. ...
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Dam, B.
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Griessen, R.
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Uppsala University