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dc.contributor.authorGray, Evan
dc.contributor.authorBlach, Tomasz
dc.contributor.authorBuckley, C.
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.en_US
dc.publisherElsevier Scienceen_US
dc.relation.ispartofjournalJournal of Alloys and Compoundsen_US
dc.titleStability of the hydrogen absorption and desorption plateaux in LaNi5–H: Part 5: H capacityen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.hasfulltextNo Full Text
gro.griffith.authorGray, Evan M.
gro.griffith.authorBlach, Tomasz P.

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