dc.contributor.author | Gray, Evan | |
dc.contributor.author | Blach, Tomasz | |
dc.contributor.author | Buckley, C. | |
dc.date.accessioned | 2019-05-23T22:22:04Z | |
dc.date.available | 2019-05-23T22:22:04Z | |
dc.date.issued | 1999 | |
dc.identifier.issn | 09258388 | |
dc.identifier.doi | 10.1016/S0925-8388(99)00301-1 | |
dc.identifier.uri | http://hdl.handle.net/10072/122457 | |
dc.description.abstract | A 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.peerreviewed | Yes | |
dc.language | English | |
dc.language.iso | eng | |
dc.publisher | Elsevier Science | |
dc.publisher.place | Switzerland | |
dc.relation.ispartofpagefrom | 57 | |
dc.relation.ispartofpageto | 61 | |
dc.relation.ispartofjournal | Journal of Alloys and Compounds | |
dc.relation.ispartofvolume | 293-295 | |
dc.subject.fieldofresearch | Condensed Matter Physics | |
dc.subject.fieldofresearch | Materials Engineering | |
dc.subject.fieldofresearch | Resources Engineering and Extractive Metallurgy | |
dc.subject.fieldofresearchcode | 0204 | |
dc.subject.fieldofresearchcode | 0912 | |
dc.subject.fieldofresearchcode | 0914 | |
dc.title | Stability of the hydrogen absorption and desorption plateaux in LaNi5–H: Part 5: H capacity | |
dc.type | Journal article | |
dc.type.description | C1 - Articles | |
dc.type.code | C - Journal Articles | |
gro.hasfulltext | No Full Text | |
gro.griffith.author | Gray, Evan M. | |
gro.griffith.author | Blach, Tomasz P. | |