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Phase Formation and Hydrogen Ordering in Yttrium-Hydrogen System

Published online by Cambridge University Press:  31 January 2011

Ke Wang ,
Jason Hattrick-Simpers  and
Leonid Bendersky
Ke Wang
Affiliation:
ke.wang@nist.gov, NIST, MSEL, Gaithersburg, Maryland, United States
Jason Hattrick-Simpers
Affiliation:
jhsimper@nist.gov, NIST, MSEL, Gaithersburg, Maryland, United States
Leonid Bendersky
Affiliation:
leoben@nist.gov, NIST, MSEL, Gaithersburg, Maryland, United States
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Abstract

Phase transformations in epitaxial yttrium films grown on (0001)Ti//(0001)Al2O3 Ti-buffered sapphire substrates and hydrogenated for 10 min were characterized using transmission electron microscopy. After hydrogen charging, dense twin lamellae form during α(Y(H))-to-β(YH2) phase transition with twin boundaries predominately parallel to the interface between Y and a substrate. High densities of Shockley partial dislocations are present at the twin boundaries, their glides during phase transformation are responsible for the formation of twin lamellae. Electron diffraction from YH2 phase shows superlattice reflections, which suggests a new type of ordering on octahedral interstitial sites.

Keywords

microstructureYhydrogenation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1216: Symposium W – Hydrogen Storage Materials , 2009 , 1216-W04-02
Copyright
Copyright © Materials Research Society 2010

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