X-ray study of radiation damage in UO2 irradiated with high-energy heavy ions

Ishikawa, N.; Sonoda, Tatsuhiko; Okamoto, Yoshihiro; Sawabe, Takashi; Takegahara, K.; Kosugi, S.; Iwase, A.

doi:10.1016/j.jnucmat.2011.08.013

Cited by 11 publications

(3 citation statements)

References 15 publications

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“…As with amorphization, unit cell expansion is characteristic of the response of many oxides to irradiation with swift heavy ions, having been observed in, for example, ZrO 2 [29,30], CeO 2 [31][32][33], ThO 2 [33,34], and UO 2 [35,36]. Possible sources of this expansion are stresses applied to the crystalline material, resulting from density changes in the amorphous tracks, and the accumulation of defects that distort the structure in their local environment and reduce atomic packing efficiency.…”

Section: Discussionmentioning

confidence: 99%

“…These results are consistent with the rapid quenching of a high temperature track core to ambient conditions, such that the inefficient atomic packing of the melt-like region is preserved. Furthermore, unit cell expansion has been observed in numerous oxides that do not adopt an amorphous phase in response to irradiation with swift heavy ions, such as fluorite-structured ZrO 2 , CeO 2 , ThO 2 , and UO 2 [29][30][31][32][33][34][35][36]. Expansion in these materials is instead typically ascribed to the accumulation of defects.…”

Section: Similarly Direct Scanning Transmission Electron Microscopy mentioning

confidence: 99%

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Anisotropic expansion and amorphization of Ga2O3 irradiated with 946 MeV Au ions

Tracy

Lang

Severin

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

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The structural response of β-Ga 2 O 3 to irradiation-induced electronic excitation was investigated. A polycrystalline pellet of this material was irradiated with 946 MeV Au ions and the resulting structural modifications were characterized using in situ x-ray diffraction analysis at various ion fluences, up to 1 × 10 13 cm-2. Amorphization was induced, with the accumulation of the amorphous phase following a single-impact mechanism in which each ion produces an amorphous ion track along its path. Concurrent with this phase transformation, an increase in the unit cell volume of the material was observed and quantified using Rietveld refinement. This unit cell expansion increased as a function of ion fluence before saturating at 1.8%. This effect is attributed to the generation of defects in an ion track shell region surrounding the amorphous track cores. The unit cell parameter increase was highly anisotropic, with no observed expansion in the [010] direction. This may be due to the structure of β-Ga 2 O 3 , which exhibits empty channels of connected interstitial sites oriented in this direction.

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Section: Discussionmentioning

confidence: 99%

Section: Similarly Direct Scanning Transmission Electron Microscopy mentioning

confidence: 99%

Anisotropic expansion and amorphization of Ga2O3 irradiated with 946 MeV Au ions

Tracy

Lang

Severin

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

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“…On the other hand the EXAFS technique has been applied much more consistently to materials damaged by irradiation for the last 35 years, including a reasonable number on Pu metal and intermetallic studies, and so this review focuses on EXAFS studies. There has, in fact, been a recent surge in such measurements of nuclear energy materials in general, such as fuels [20][21][22] and fuel cladding and other materials (e.g. [23][24][25]), and even ion implanting in the semiconductor industry [26], not to mention a long history of such studies of nuclear waste forms (for a recent example, see Ref.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature and radiation damage on the local atomic structure of metallic plutonium and related compounds

Booth

Olive

2016

Advances in Physics: X

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This focused review provides an overview and a framework for understanding local structure in metallic plutonium (especially the metastable fcc δ-phase alloyed with Ga) as it relates to self-irradiation damage. Of particular concern is the challenge of understanding self-irradiation damage in plutonium-bearing materials where theoretical challenges of the unique involvement of the 5f electrons in bonding limit the efficacy of molecular dynamics simulations and experimental challenges of working with radioactive material have limited the ability to confirm the results of such simulations and to further push the field forward. The main concentration is on extended X-ray absorption fine-structure measurements of δ-phase Pu, but the scope is broadened to include certain studies on plutonium intermetallics and oxides insofar as they inform the physics of damage and healing processes in elemental Pu. The studies reviewed here provide insight into lattice distortions and their production, damage annealing and defect migration, and the importance of understanding and controlling sample morphology when interpreting such experiments.

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Heterogeneous UO2 fuel irradiated up to a high burn-up: Investigation of the HBS and of fission product releases

Noirot¹,

Lamontagne²,

Nakae³

et al. 2013

Journal of Nuclear Materials

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X-ray study of radiation damage in UO2 irradiated with high-energy heavy ions

Cited by 11 publications

References 15 publications

Anisotropic expansion and amorphization of Ga2O3 irradiated with 946 MeV Au ions

Anisotropic expansion and amorphization of Ga2O3 irradiated with 946 MeV Au ions

Effect of temperature and radiation damage on the local atomic structure of metallic plutonium and related compounds

Heterogeneous UO2 fuel irradiated up to a high burn-up: Investigation of the HBS and of fission product releases

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