TY - JOUR
T1 - Defect formation and accumulation in CeO2 irradiated with swift heavy ions
AU - Yasuda, K.
AU - Etoh, M.
AU - Sawada, K.
AU - Yamamoto, T.
AU - Yasunaga, K.
AU - Matsumura, S.
AU - Ishikawa, N.
N1 - Funding Information:
Swift heavy ion irradiation was carried out at ion accelerator facility in JAEA-Tokai. A part of electron microscopy observations/analyses was done at the HVEM Laboratory of Kyushu University. The authors are grateful to technical stuffs of both research facilities for their skillful technical assistance. This work includes results conducted under the budget for nuclear research supported by MEXT , based on screening and counseling by Atomic Energy Commission .
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - We have investigated microstructure evolution in CeO2 irradiated with 210 MeV Xe ions by using transmission electron microscopy to gain the fundamental knowledge on radiation damage induced by fission fragments in nuclear fuel and transmutation target. Analysis on the accumulation of ion tracks has revealed an influence region to recover pre-existing core damage regions of ion tracks to be 8.4 nm in radius. Cross section observations showed that high-density electronic excitation induces both ion tracks and dislocation loops. At high fluences of 1.5 × 1019 and 1 × 10 20 ions m-2, depth-dependent microstructure was developed with radiation-induced defects of ion tracks, dislocation loops (dot-contrast) and line dislocations. Formation of sub-divided small grains was found at shallow depth at a fluence of 1 × 1020 ions m-2. The microstructure evolution was discussed in terms of the accumulation of interstitials due to significant overlap of high density electronic excitation.
AB - We have investigated microstructure evolution in CeO2 irradiated with 210 MeV Xe ions by using transmission electron microscopy to gain the fundamental knowledge on radiation damage induced by fission fragments in nuclear fuel and transmutation target. Analysis on the accumulation of ion tracks has revealed an influence region to recover pre-existing core damage regions of ion tracks to be 8.4 nm in radius. Cross section observations showed that high-density electronic excitation induces both ion tracks and dislocation loops. At high fluences of 1.5 × 1019 and 1 × 10 20 ions m-2, depth-dependent microstructure was developed with radiation-induced defects of ion tracks, dislocation loops (dot-contrast) and line dislocations. Formation of sub-divided small grains was found at shallow depth at a fluence of 1 × 1020 ions m-2. The microstructure evolution was discussed in terms of the accumulation of interstitials due to significant overlap of high density electronic excitation.
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U2 - 10.1016/j.nimb.2013.04.069
DO - 10.1016/j.nimb.2013.04.069
M3 - Article
AN - SCOPUS:84886594722
SN - 0168-583X
VL - 314
SP - 185
EP - 190
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
ER -