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

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 ºC via the transient growth of an interfacial phase, the {gamma} 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.
Authors:
; ; ;  [1] ;  [2]
  1. Griffith U
  2. (
Publication Date:
OSTI Identifier:
1021190
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Alloys and Compounds; Journal Volume: 509; Journal Issue: (5) ; 02, 2011
Publisher:
Elsevier
Research Org:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Org:
FOREIGNNSF
Country of Publication:
United States
Language:
ENGLISH
Subject:
08 HYDROGEN; ABSORPTION; DIFFRACTION; HYDRIDES; HYDROGEN; HYDROGEN STORAGE; KINETICS; LATTICE PARAMETERS; PHASE TRANSFORMATIONS; SOLID SOLUTIONS; SYNCHROTRONS; TRANSFORMATIONS; TRANSIENTS; X-RAY DIFFRACTION