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Title: Micro-structural changes and helium release in thin films of Er(DT)2.

Abstract

Abstract not provided.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1267225
Report Number(s):
SAND2007-0489C
524032
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the Hydrogen and Helium Isotopes in Materials held February 6-7, 2007 in Albuquerque, NM.
Country of Publication:
United States
Language:
English

Citation Formats

Snow, Clark Sheldon, Browning, James Frederick, Brewer, Luke N., and Rodriguez, Mark A. Micro-structural changes and helium release in thin films of Er(DT)2.. United States: N. p., 2007. Web.
Snow, Clark Sheldon, Browning, James Frederick, Brewer, Luke N., & Rodriguez, Mark A. Micro-structural changes and helium release in thin films of Er(DT)2.. United States.
Snow, Clark Sheldon, Browning, James Frederick, Brewer, Luke N., and Rodriguez, Mark A. Mon . "Micro-structural changes and helium release in thin films of Er(DT)2.". United States. doi:. https://www.osti.gov/servlets/purl/1267225.
@article{osti_1267225,
title = {Micro-structural changes and helium release in thin films of Er(DT)2.},
author = {Snow, Clark Sheldon and Browning, James Frederick and Brewer, Luke N. and Rodriguez, Mark A},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • Er(D,T){sub 2-x} {sup 3}He{sub x}, erbium di-tritide, films of thicknesses 500 nm, 400 nm, 300 nm, 200 nm, and 100 nm were grown and analyzed by Transmission Electron Microscopy, X-Ray Diffraction, and Ion Beam Analysis to determine variations in film microstructure as a function of film thickness and age, due to the time-dependent build-up of {sup 3}He in the film from the radioactive decay of tritium. Several interesting features were observed: One, the amount of helium released as a function of film thickness is relatively constant. This suggests that the helium is being released only from the near surface regionmore » and that the helium is not diffusing to the surface from the bulk of the film. Two, lenticular helium bubbles are observed as a result of the radioactive decay of tritium into {sup 3}He. These bubbles grow along the [111] crystallographic direction. Three, a helium bubble free zone, or 'denuded zone' is observed near the surface. The size of this region is independent of film thickness. Four, an analysis of secondary diffraction spots in the Transmission Electron Microscopy study indicate that small erbium oxide precipitates, 5-10 nm in size, exist throughout the film. Further, all of the films had large erbium oxide inclusions, in many cases these inclusions span the depth of the film.« less
  • No abstract prepared.
  • In the last years, research on gas sensors has been devoted to the preparation of new and reliable nanostructured materials for long-term operation. The authors report about the preparation of a novel material, achieved by deposition of TiO{sub 2} and WO{sub 3} via reactive r.f. sputtering on either alumina or SiO{sub 2}/Si substrate. Thin-films are annealed in the range of 600-800{degrees}C to reach a stable structure.
  • Changes in the crystal structure and grain modifications in titanium oxide (TiO{sub 2}) thin films were observed during the photocatalytic oxidation of hydrocarbons. When the hydrocarbon and collodion films were irradiated, single crystalline titanium oxide transformed into polycrystals. The titanium oxide films gradually became network aggregates. These changes were analyzed with a dedicated in situ transmission electron microscope and observed three dimensionally by electron tomography. A detailed analysis of electron energy loss spectra of the samples also revealed that the changes were associated with the loss of oxygen atoms in the TiO{sub 2} crystal lattice. Correlations between the polycrystalline grainmore » size of TiO{sub 2} and its catalyst activity were discussed based on the measured data.« less