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  • Baldi, A. (author)

Mg/Ti multilayers : Structural and hydrogen absorption properties

  • Article/chapterEnglish2010

Publisher, publication year, extent ...

  • 2010
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-135537
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-135537URI
  • https://doi.org/10.1103/PhysRevB.81.224203DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Pálsson, Gunnar K.Uppsala universitet,Materialfysik(Swepub:uu)gukpa839 (author)
  • Gonzalez-Silveira, M. (author)
  • Schreuders, H. (author)
  • Slaman, M. (author)
  • Rector, J. H. (author)
  • Krishnan, G. (author)
  • Kooi, B. J. (author)
  • Walker, G. S. (author)
  • Fay, M. W. (author)
  • Hjörvarsson, BjörgvinUppsala universitet,Materialfysik(Swepub:uu)bjorghvs (author)
  • Wijngaarden, R. J. (author)
  • Dam, B. (author)
  • Griessen, R. (author)
  • Uppsala universitetMaterialfysik (creator_code:org_t)

Related titles

  • In:Physical Review B. Condensed Matter and Materials Physics81:22, s. 224203-1098-01211550-235X

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