Mechanism of the α-to-β phase transformation in the LaNi5–H2 system

Gray, E.MacA., Blach, T.P., Pitt, M.P., & Cookson, D.J. (2011) Mechanism of the α-to-β phase transformation in the LaNi5–H2 system. Journal of Alloys and Compounds, 509(5), pp. 1630-1635.

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High-energy synchrotron in situ X-ray powder diffraction has been used to elucidate the mechanism of the hydriding phase transformation in a LaNi5 model hydrogen storage intermetallic in real time. The transformation proceeds at 10 °C via the transient growth of an interfacial phase, the γ phase, with lattice parameters intermediate between those of the α (dilute solid solution) and β (concentrated hydride) phases. The γ phase forms to partially accommodate the 24% change in unit cell volume between the α and β phases during hydriding and dehydriding. The α, γ and β phases coexist at the nanoscopic level.

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ID Code: 70379
Item Type: Journal Article
Refereed: Yes
Keywords: Hydrides, Hydrogen absorption, Phase transformation kinetics, X-ray diffraction
DOI: 10.1016/j.jallcom.2010.11.083
ISSN: 09258388
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 Elsevier B.V.
Deposited On: 23 Apr 2014 04:23
Last Modified: 16 May 2014 05:42

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