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

Jiang, Weilin; Conroy, Michele A.; Kruska, Karen; Overman, Nicole R.; Droubay, Timothy C.; Gigax, Jonathan; Shao, Lin; Devanathan, Ram

doi:10.1021/acs.jpcc.7b06188

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

Journal Article · Fri Sep 29 00:00:00 EDT 2017 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.7b06188· OSTI ID:1406707

^[1]; Conroy, Michele A. ^[1]; Kruska, Karen ^[1]; Overman, Nicole R. ^[1]; Droubay, Timothy C. ^[1]; Gigax, Jonathan ^[2]; Shao, Lin ^[2]; Devanathan, Ram ^[1]

Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
Texas A&,M University, 3380 University Drive East, College Station, Texas 77845, United States

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.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1406707

Report Number(s):: PNNL-SA-126918; 49576

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 40 Vol. 121; ISSN 1932-7447

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

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