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

Abstract

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]
  1. Griffith U
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGNNSF
OSTI Identifier:
1021190
Resource Type:
Journal Article
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 509; Journal Issue: (5) ; 02, 2011; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
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

Citation Formats

Gray, E. MacA., Blach, T. P., Pitt, M. P., Cookson, D. J., and ASRP). Mechanism of the α-to-β phase transformation in the LaNi5-H2 system. United States: N. p., 2014. Web. doi:10.1016/j.jallcom.2010.11.083.
Gray, E. MacA., Blach, T. P., Pitt, M. P., Cookson, D. J., & ASRP). Mechanism of the α-to-β phase transformation in the LaNi5-H2 system. United States. https://doi.org/10.1016/j.jallcom.2010.11.083
Gray, E. MacA., Blach, T. P., Pitt, M. P., Cookson, D. J., and ASRP). 2014. "Mechanism of the α-to-β phase transformation in the LaNi5-H2 system". United States. https://doi.org/10.1016/j.jallcom.2010.11.083.
@article{osti_1021190,
title = {Mechanism of the α-to-β phase transformation in the LaNi5-H2 system},
author = {Gray, E. MacA. and Blach, T. P. and Pitt, M. P. and Cookson, D. J. and ASRP)},
abstractNote = {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.},
doi = {10.1016/j.jallcom.2010.11.083},
url = {https://www.osti.gov/biblio/1021190}, journal = {Journal of Alloys and Compounds},
issn = {0925-8388},
number = (5) ; 02, 2011,
volume = 509,
place = {United States},
year = {Wed Sep 24 00:00:00 EDT 2014},
month = {Wed Sep 24 00:00:00 EDT 2014}
}