Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 454, Issue 1-3, Pages 283-289Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2014.07.053
Keywords
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Funding
- Center for Materials Science of Nuclear Fuel, Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
- U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office, ATR National Scientific [DE-AC07-051D14517]
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The microstructural changes and associated effects on thermal conductivity were examined in UO2 after irradiation using 3.9 MeV He2+ ions. Lattice expansion of UO2 was observed in X-ray diffraction after ion irradiation up to 5 x 1016 He2+/cm(2) at low-temperature (<200 degrees C). Transmission electron microscopy (TEM) showed homogenous irradiation damage across an 8 mu m thick plateau region, which consisted of small dislocation loops accompanied by dislocation segments. Dome-shaped blisters were observed at the peak damage region (depth around 8.5 mu m) in the sample subjected to 5 x 10(16) He2+/cm(2), the highest fluence reached, while similar features were not detected at 9 x 10(15) He2+/cm(2). Laser-based thermoreflectance measurements showed that the thermal conductivity for the irradiated layer decreased about 55% for the high fluence sample and 35% for the low fluence sample as compared to an un-irradiated reference sample. Detailed analysis for the thermal conductivity indicated that the conductivity reduction was caused by the irradiation induced point defects. (C) 2014 Elsevier B.V. All rights reserved.
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