Mg/Ti multilayers: Structural and hydrogen absorption properties

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Fältnamn	Indikatorer	Metadata
000		03030naa a2200457 4500
001		oai:DiVA.org:uu-135537
003		SwePub
008		101207s2010 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1355372 URI
024	7	a https://doi.org/10.1103/PhysRevB.81.2242032 DOI
040		a (SwePub)uu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Baldi, A.4 aut
245	1 0	a Mg/Ti multilayers :b Structural and hydrogen absorption properties
264	1	c 2010
338		a print2 rdacarrier
520		a 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.
650	7	a NATURVETENSKAPx Fysik0 (SwePub)1032 hsv//swe
650	7	a NATURAL SCIENCESx Physical Sciences0 (SwePub)1032 hsv//eng
653		a Physics
653		a Fysik
700	1	a Pálsson, Gunnar K.u Uppsala universitet,Materialfysik4 aut0 (Swepub:uu)gukpa839
700	1	a Gonzalez-Silveira, M.4 aut
700	1	a Schreuders, H.4 aut
700	1	a Slaman, M.4 aut
700	1	a Rector, J. H.4 aut
700	1	a Krishnan, G.4 aut
700	1	a Kooi, B. J.4 aut
700	1	a Walker, G. S.4 aut
700	1	a Fay, M. W.4 aut
700	1	a Hjörvarsson, Björgvinu Uppsala universitet,Materialfysik4 aut0 (Swepub:uu)bjorghvs
700	1	a Wijngaarden, R. J.4 aut
700	1	a Dam, B.4 aut
700	1	a Griessen, R.4 aut
710	2	a Uppsala universitetb Materialfysik4 org
773	0	t Physical Review B. Condensed Matter and Materials Physicsg 81:22, s. 224203-q 81:22<224203-x 1098-0121x 1550-235X
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-135537
856	4 8	u https://doi.org/10.1103/PhysRevB.81.224203

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Av författaren/redakt...: Baldi, A.; Pálsson, Gunnar ...; Gonzalez-Silveir ...; Schreuders, H.; Slaman, M.; Rector, J. H.; visa fler...; Krishnan, G.; Kooi, B. J.; Walker, G. S.; Fay, M. W.; Hjörvarsson, Bjö ...; Wijngaarden, R. ...; Dam, B.; Griessen, R.; visa färre...

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