Isochronal annealing effects on local structure, crystalline fraction, and undamaged region size of radiation damage in Ga-stabilized δ-Pu
Abstract
© 2016 Author(s). The effects on the local structure due to self-irradiation damage of Ga stabilized δ-Pu stored at cryogenic temperatures have been examined using extended x-ray absorption fine structure (EXAFS) experiments. Extensive damage, seen as a loss of local order, was evident after 72 days of storage below 15 K. The effect was observed from both the Pu and the Ga sites, although less pronounced around Ga. Isochronal annealing was performed on this sample to study the annealing processes that occur between cryogenic and room temperature storage conditions, where damage is mostly reversed. Damage fractions at various points along the annealing curve have been determined using an amplitude-ratio method, a standard EXAFS fitting, and a spherical crystallite model, and provide information complementary to the previous electrical resistivity- and susceptibility-based isochronal annealing studies. The use of a spherical crystallite model accounts for the changes in EXAFS spectra using just two parameters, namely, the crystalline fraction and the particle radius. Together, these results are discussed in terms of changes to the local structure around Ga and Pu throughout the annealing process and highlight the unusual role of Ga in the behavior of the lowest temperature anneals.
- Authors:
-
[1];
[4];
[4];
[4];
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1313548
- Alternate Identifier(s):
- OSTI ID: 1357113; OSTI ID: 1408399; OSTI ID: 1421257
- Report Number(s):
- LLNL-JRNL-682498; LA-UR-16-20844
Journal ID: ISSN 0021-8979
- Grant/Contract Number:
- AC52-07NA27344; AC02-05CH11231; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 3; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; extended X-ray absorption fine structure spectroscopy; electrical resistivity; crystal structure; computer modeling; magnetic annealing
Citation Formats
Olive, D. T., Booth, C. H., Wang, D. L., Bauer, E. D., Pugmire, A. L., Freibert, F. J., McCall, S. K., Wall, M. A., and Allen, P. G. Isochronal annealing effects on local structure, crystalline fraction, and undamaged region size of radiation damage in Ga-stabilized δ-Pu. United States: N. p., 2016.
Web. doi:10.1063/1.4958856.
Olive, D. T., Booth, C. H., Wang, D. L., Bauer, E. D., Pugmire, A. L., Freibert, F. J., McCall, S. K., Wall, M. A., & Allen, P. G. Isochronal annealing effects on local structure, crystalline fraction, and undamaged region size of radiation damage in Ga-stabilized δ-Pu. United States. https://doi.org/10.1063/1.4958856
Olive, D. T., Booth, C. H., Wang, D. L., Bauer, E. D., Pugmire, A. L., Freibert, F. J., McCall, S. K., Wall, M. A., and Allen, P. G. Tue .
"Isochronal annealing effects on local structure, crystalline fraction, and undamaged region size of radiation damage in Ga-stabilized δ-Pu". United States. https://doi.org/10.1063/1.4958856. https://www.osti.gov/servlets/purl/1313548.
@article{osti_1313548,
title = {Isochronal annealing effects on local structure, crystalline fraction, and undamaged region size of radiation damage in Ga-stabilized δ-Pu},
author = {Olive, D. T. and Booth, C. H. and Wang, D. L. and Bauer, E. D. and Pugmire, A. L. and Freibert, F. J. and McCall, S. K. and Wall, M. A. and Allen, P. G.},
abstractNote = {© 2016 Author(s). The effects on the local structure due to self-irradiation damage of Ga stabilized δ-Pu stored at cryogenic temperatures have been examined using extended x-ray absorption fine structure (EXAFS) experiments. Extensive damage, seen as a loss of local order, was evident after 72 days of storage below 15 K. The effect was observed from both the Pu and the Ga sites, although less pronounced around Ga. Isochronal annealing was performed on this sample to study the annealing processes that occur between cryogenic and room temperature storage conditions, where damage is mostly reversed. Damage fractions at various points along the annealing curve have been determined using an amplitude-ratio method, a standard EXAFS fitting, and a spherical crystallite model, and provide information complementary to the previous electrical resistivity- and susceptibility-based isochronal annealing studies. The use of a spherical crystallite model accounts for the changes in EXAFS spectra using just two parameters, namely, the crystalline fraction and the particle radius. Together, these results are discussed in terms of changes to the local structure around Ga and Pu throughout the annealing process and highlight the unusual role of Ga in the behavior of the lowest temperature anneals.},
doi = {10.1063/1.4958856},
journal = {Journal of Applied Physics},
number = 3,
volume = 120,
place = {United States},
year = {Tue Jul 19 00:00:00 EDT 2016},
month = {Tue Jul 19 00:00:00 EDT 2016}
}
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