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dc.contributor.authorGray, Evan
dc.contributor.authorBlach, Tomasz
dc.contributor.authorBuckley, C.
dc.date.accessioned2019-05-23T22:22:04Z
dc.date.available2019-05-23T22:22:04Z
dc.date.issued1999
dc.identifier.issn09258388
dc.identifier.doi10.1016/S0925-8388(99)00301-1
dc.identifier.urihttp://hdl.handle.net/10072/122457
dc.description.abstractA systematic study was made by gravimetry, carefully preserving the system mass zero, of the positions of the α/α+β and α+β/β phase boundaries and the plateau lengths in LaNi5–H, while absorption–desorption cycling under various conditions of temperature and pressure. Our findings include: (i) in agreement with previous studies, the initial capacity of the virgin intermetallic is in excess of H/M=1.1; (ii) however, the initial desorption plateau is shorter than the initial absorption plateau by nearly 0.1 in H/M, owing to the trapping of H, possibly in lattice defects; (iii) absorption–desorption cycling at any temperature in impure hydrogen shortens the plateaux (capacity degradation), greatly exacerbated by elevated temperature; (iv) however, the total H capacity remains relatively constant, with an exchange of H between ‘reversible’ sites and trap sites, manifest as the drift in the α/α+β phase boundary noted above. The reality of the H trapping owing to activation has been proved by independent techniques, such as deep-inelastic neutron scattering. It is unlikely that this H is initially trapped in the form of LaHx, although this and other La–Ni hydrides do form during extended cycling at elevated temperatures.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier Science
dc.publisher.placeSwitzerland
dc.relation.ispartofpagefrom57
dc.relation.ispartofpageto61
dc.relation.ispartofjournalJournal of Alloys and Compounds
dc.relation.ispartofvolume293-295
dc.subject.fieldofresearchCondensed Matter Physics
dc.subject.fieldofresearchMaterials Engineering
dc.subject.fieldofresearchResources Engineering and Extractive Metallurgy
dc.subject.fieldofresearchcode0204
dc.subject.fieldofresearchcode0912
dc.subject.fieldofresearchcode0914
dc.titleStability of the hydrogen absorption and desorption plateaux in LaNi5–H: Part 5: H capacity
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.hasfulltextNo Full Text
gro.griffith.authorGray, Evan M.
gro.griffith.authorBlach, Tomasz P.


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