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Phase Formation and Hydrogen Ordering in Yttrium-Hydrogen System

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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.

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Authors and Affiliations

  1. Materials Science and Engineering Laboratory, National Institute of Standards and Technology, 20899, Gaithersburg, MD, USA

    Ke Wang, R. Hattrick-Simpers Jason & A. Bendersky Leonid

Authors
  1. Ke Wang
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  2. R. Hattrick-Simpers Jason
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  3. A. Bendersky Leonid
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Wang, K., Jason, R.HS. & Leonid, A.B. Phase Formation and Hydrogen Ordering in Yttrium-Hydrogen System. MRS Online Proceedings Library 1216, 402 (2009). https://doi.org/10.1557/PROC-1216-W04-02

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  • DOI: https://doi.org/10.1557/PROC-1216-W04-02

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