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Title: Nanoparticle Precipitation in Irradiated and Annealed Ceria Doped with Metals for Emulation of Spent Fuels

Abstract

Epsilon alloy precipitates have been observed with varied compositions and sizes in spent nuclear fuels, such as UO2. Presence of the inclusions, along with other oxide precipitates, gas bubbles and irradiation-induced structural defects, can significantly degrade the physical properties of the fuel. To predict fuel performance, a fundamental study of the precipitation processes is needed. This study uses ceria (CeO2) as a surrogate for UO2. Polycrystalline CeO2 films doped with Mo, Ru, Rh, Pd and Re (surrogate for Tc) were grown at 823 K using pulsed laser deposition, irradiated at 673 K with He+ ions, and subsequently annealed at higher temperatures. A number of methods, including transmission electron microscopy and atom probe tomography, were applied to characterize the samples. The results indicate that there is a uniform distribution of the doped metals in the as-grown CeO2 film. Pd particles of ~3 nm in size appear near dislocation edges after He+ ion irradiation to ~13 dpa. Thermal annealing at 1073 K in air leads to formation of precipitates with Mo and Pd around grain boundaries. Further annealing at 1373 K produces 70 nm sized precipitates with small grains at cavities.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1]
  1. Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
  2. Texas A&,M University, 3380 University Drive East, College Station, Texas 77845, United States
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1406707
Report Number(s):
PNNL-SA-126918
Journal ID: ISSN 1932-7447; 49576
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry. C; Journal Volume: 121; Journal Issue: 40
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Jiang, Weilin, Conroy, Michele A., Kruska, Karen, Overman, Nicole R., Droubay, Timothy C., Gigax, Jonathan, Shao, Lin, and Devanathan, Ram. Nanoparticle Precipitation in Irradiated and Annealed Ceria Doped with Metals for Emulation of Spent Fuels. United States: N. p., 2017. Web. doi:10.1021/acs.jpcc.7b06188.
Jiang, Weilin, Conroy, Michele A., Kruska, Karen, Overman, Nicole R., Droubay, Timothy C., Gigax, Jonathan, Shao, Lin, & Devanathan, Ram. Nanoparticle Precipitation in Irradiated and Annealed Ceria Doped with Metals for Emulation of Spent Fuels. United States. doi:10.1021/acs.jpcc.7b06188.
Jiang, Weilin, Conroy, Michele A., Kruska, Karen, Overman, Nicole R., Droubay, Timothy C., Gigax, Jonathan, Shao, Lin, and Devanathan, Ram. Fri . "Nanoparticle Precipitation in Irradiated and Annealed Ceria Doped with Metals for Emulation of Spent Fuels". United States. doi:10.1021/acs.jpcc.7b06188.
@article{osti_1406707,
title = {Nanoparticle Precipitation in Irradiated and Annealed Ceria Doped with Metals for Emulation of Spent Fuels},
author = {Jiang, Weilin and Conroy, Michele A. and Kruska, Karen and Overman, Nicole R. and Droubay, Timothy C. and Gigax, Jonathan and Shao, Lin and Devanathan, Ram},
abstractNote = {Epsilon alloy precipitates have been observed with varied compositions and sizes in spent nuclear fuels, such as UO2. Presence of the inclusions, along with other oxide precipitates, gas bubbles and irradiation-induced structural defects, can significantly degrade the physical properties of the fuel. To predict fuel performance, a fundamental study of the precipitation processes is needed. This study uses ceria (CeO2) as a surrogate for UO2. Polycrystalline CeO2 films doped with Mo, Ru, Rh, Pd and Re (surrogate for Tc) were grown at 823 K using pulsed laser deposition, irradiated at 673 K with He+ ions, and subsequently annealed at higher temperatures. A number of methods, including transmission electron microscopy and atom probe tomography, were applied to characterize the samples. The results indicate that there is a uniform distribution of the doped metals in the as-grown CeO2 film. Pd particles of ~3 nm in size appear near dislocation edges after He+ ion irradiation to ~13 dpa. Thermal annealing at 1073 K in air leads to formation of precipitates with Mo and Pd around grain boundaries. Further annealing at 1373 K produces 70 nm sized precipitates with small grains at cavities.},
doi = {10.1021/acs.jpcc.7b06188},
journal = {Journal of Physical Chemistry. C},
number = 40,
volume = 121,
place = {United States},
year = {Fri Sep 29 00:00:00 EDT 2017},
month = {Fri Sep 29 00:00:00 EDT 2017}
}