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Processing effects on microstructure in Er and ErD<sub>2</sub> thin-films [electronic resource].

Published
Washington, D.C. : United States. National Nuclear Security Administration, 2010.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 191-197 : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. National Nuclear Security Administration, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Erbium metal thin-films have been deposited on molybdenum-on-silicon substrates and then converted to erbium dideuteride (ErD2). Here in this work, we study the effects of deposition temperature (≈300 or 723 K) and deposition rate (1 or 20 nm/s) upon the initial Er metal microstructure and subsequent ErD2 microstructure. We find that low deposition temperature and low deposition rate lead to small Er metal grain sizes, and high deposition temperature and deposition rate led to larger Er metal grain sizes, consistent with published models of metal thin-film growth. ErD2 grain sizes are strongly influenced by the prior-metal grain size, with small metal grains leading to large ErD2 grains. A novel sample preparation technique for electron backscatter diffraction of air-sensitive ErD2 was developed, and allowed the quantitative measurement of ErD2 grain size and crystallographic texture. Finer-grained ErD2 showed a strong (1 1 1) fiber texture, whereas larger grained ErD2 had only weak texture. Finally, we hypothesize that this inverse correlation may arise from improved hydrogen diffusion kinetics in the more defective fine-grained metal structure or due to improved nucleation in the textured large-grain Er.
Report Numbers
E 1.99:sand--2009-5228j
sand--2009-5228j
Subject(s)
Note
Published through SciTech Connect.
06/25/2010.
"sand--2009-5228j"
"563588"
Journal of Nuclear Materials 403 1-3 ISSN 0022-3115 AM
Chad M. Parish; Clark S. Snow; Daniel R. Kammler; Luke N. Brewer.
Funding Information
AC04-94AL85000
View MARC record | catkey: 24479665