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The effect of micro...
The effect of microstructure on the hydrogenation of Mg/Fe thin film multilayers
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- Mooij, Lennard (author)
- Uppsala universitet,Materialfysik
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Perkisas, Tyche (author)
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- Pálsson, Gunnar (author)
- Uppsala universitet,Materialfysik
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Schreuders, Herman (author)
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- Wolff, Max (author)
- Uppsala universitet,Materialfysik
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- Hjörvarsson, Björgvin (author)
- Uppsala universitet,Materialfysik
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Bals, Sara (author)
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Dam, Bernard (author)
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(creator_code:org_t)
- Elsevier BV, 2014
- 2014
- English.
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In: International journal of hydrogen energy. - : Elsevier BV. - 0360-3199 .- 1879-3487. ; 39:30, s. 17092-17103
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Nanoconfined magnesium hydride can be simultaneously protected and thermodynamically destabilized when interfaced with materials such as Ti and Fe. We study the hydrogenation of thin layers of Mg (<14 nm) nanoconfined in one dimension within thin film Fe/Mg/Fe/Pd multilayers by the optical technique Hydrogenography. The hydrogenation of nanosized magnesium layers in Fe/Mg/Fe multilayers surprisingly shows the presence of multiple plateau pressures, whose nature is thickness dependent. In contrast, hydrogen desorption occurs via a single plateau which does not depend on the Mg layer thickness. From structural and morphological analyses with X-ray diffraction/reflectometry and cross-section TEM, we find that the Mg layer roughness is large when deposited on Fe and furthermore contains high-angle grain boundaries (GB's). When grown on Ti, the Mg layer roughness is low and no high-angle GB's are detected. From a Ti/Mg/Fe multilayer, in which the Mg layer is flat and has little or no GB's, we conclude that MgH2 is indeed destabilized by the interface with Fe. In this case, both the ab- and desorption plateau pressures are increased by a factor two compared to the hydrogenation of Mg within Ti/Mg/Ti multilayers. We hypothesize that the GB's in the Fe/Mg/Fe multilayer act as diffusion pathways for Pd, which is known to greatly alter the hydrogenation behavior of Mg when the two materials share an interface.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Magnesium hydride
- Hydrogen storage
- Thin films
- Multi layers
- Nanoconfinement
Publication and Content Type
- ref (subject category)
- art (subject category)
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