Processing effects on microstructure in Er and ErD2 thin-films

Parish, Chad M.; Snow, Clark S.; Kammler, Daniel R.; Brewer, Luke N.

doi:10.1016/j.jnucmat.2010.06.026

Processing effects on microstructure in Er and ErD₂ thin-films

Journal Article · Fri Jun 25 00:00:00 EDT 2010 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2010.06.026· OSTI ID:1426929

Parish, Chad M. ^[1]; Snow, Clark S. ^[2]; Kammler, Daniel R. ^[2]; Brewer, Luke N. ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1426929

Alternate ID(s):: OSTI ID: 983547

Report Number(s):: SAND--2009-5228J; 563588

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: 1-3 Vol. 403; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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