Recovery and restructuring induced by fission energy ions in high burnup nuclear fuel

Kinoshita, Motoyasu; Yasunaga, Kōjirō; Sonoda, Tatsuhiko; Iwase, A.; Ishikawa, N.; Sataka, M.; Yasuda, Kazuhiro; Matsumura, Shuichi; Geng, Hua-Yun; Ichinomiya, Takashi; Chen, Y.; Kaneta, Yasunori; Iwasawa, Misako; Ohnuma, Toshiharu; Nishiura, Yasumasa; Nakamura, Jinichi; Matzke, Hj.

doi:10.1016/j.nimb.2009.02.022

Cited by 30 publications

(6 citation statements)

References 12 publications

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“…Consistent with our results, this suggests that damage accumulation in this reducible material is driven by concurrent cation valence changes and anion-specific Frenkel pair formation, a process distinct from that of nonreducible ThO 2 . Similar oxygen-selective point defect production has been observed in CeO 2 irradiated with electrons [36][37][38] , which deposit energy through isolated electron excitation, confirming that the formation of these ion tracks is an effect of ionization. In this work, clusters of interstitial oxygen were observed, indicating that anions preferentially displaced by ionizing radiation tend to aggregate in planar interstitial dislocation loops 37 , which have been identified as a possible cause of problematic microstructure changes in the rim region of nuclear fuel pellets 22 .…”

Section: Resultssupporting

confidence: 67%

Redox response of actinide materials to highly ionizing radiation

et al. 2015

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Energetic radiation can cause dramatic changes in the physical and chemical properties of actinide materials, degrading their performance in fission-based energy systems. As advanced nuclear fuels and wasteforms are developed, fundamental understanding of the processes controlling radiation damage accumulation is necessary. Here we report oxidation state reduction of actinide and analogue elements caused by high-energy, heavy ion irradiation and demonstrate coupling of this redox behaviour with structural modifications. ThO 2 , in which thorium is stable only in a tetravalent state, exhibits damage accumulation processes distinct from those of multivalent cation compounds CeO 2 (Ce 3 þ and Ce 4 þ ) and UO 3 (U 4 þ , U 5 þ and U 6 þ ). The radiation tolerance of these materials depends on the efficiency of this redox reaction, such that damage can be inhibited by altering grain size and cation valence variability. Thus, the redox behaviour of actinide materials is important for the design of nuclear fuels and the prediction of their performance.

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Section: Resultssupporting

confidence: 67%

Redox response of actinide materials to highly ionizing radiation

et al. 2015

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“…Two scattering techniques have been most extensively used in the study of irradiated CeO 2 : diffraction and total scattering. Diffraction experiments allow for quantification of the long-range volumetric changes (unit cell swelling) caused by the production of de-fects [14,36,38,39,41,[46][47][48]53,55,57,60,61], as well as heterogeneous microstrain and phase transformations, should they occur. Total scattering experiments are used to study the local defect structure using real-space analysis.…”

Section: Characterizationmentioning

confidence: 99%

Review of Swift Heavy Ion Irradiation Effects in CeO2

Cureton

Tracy

Lang

2021

QuBS

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Cerium dioxide (CeO2) exhibits complex behavior when irradiated with swift heavy ions. Modifications to this material originate from the production of atomic-scale defects, which accumulate and induce changes to the microstructure, chemistry, and material properties. As such, characterizing its radiation response requires a wide range of complementary characterization techniques to elucidate the defect formation and stability over multiple length scales, such as X-ray and neutron scattering, optical spectroscopy, and electron microscopy. In this article, recent experimental efforts are reviewed in order to holistically assess the current understanding and knowledge gaps regarding the underlying physical mechanisms that dictate the response of CeO2 and related materials to irradiation with swift heavy ions. The recent application of novel experimental techniques has provided additional insight into the structural and chemical behavior of irradiation-induced defects, from the local, atomic-scale arrangement to the long-range structure. However, future work must carefully account for the influence of experimental conditions, with respect to both sample properties (e.g., grain size and impurity content) and ion-beam parameters (e.g., ion mass and energy), to facilitate a more direct comparison of experimental results.

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“…Cerium dioxide is known as a non-radioactive structural substitute of actinide oxides (UO 2 and PuO 2 ). 1,2 CeO 2 -based ceramics are suggested as an inert 239 Pu or 235 U bearing matrix for nuclear fuel, as well as a matrix for high-level waste disposal. 1,3 CeO 2 is also used an exhaust gas afterburning catalyst 4,5 and in electronics.…”

Section: Introductionmentioning

confidence: 99%

The electronic structure and the nature of the chemical bond in CeO₂

Maslakov

Teterin

Ryzhkov

et al. 2018

Phys. Chem. Chem. Phys.

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The X-ray photoelectron spectral structure of CeO2 valence electrons in the binding energy range of 0 to ∼50 eV was analyzed. The core-electron spectral structure parameters and the results of relativistic discrete-variational calculations of CeO8 and Ce63O216 clusters were taken into account. Comparison of the valence and the core-electron spectral structures showed that the formation of the inner (IVMO) and the outer (OVMO) valence molecular orbitals contributes to the spectral structure more than the many-body processes. The Ce 4f electrons were established to participate directly in chemical bond formation in CeO2 losing partially their f character. They were found to be localized mostly within the outer valence band. The Ce 5p atomic orbitals were shown to participate in the formation of both the inner and the outer valence molecular orbitals (MOs). A large part in the IVMO formation is taken by the filled Ce 5p1/2, 5p3/2 and O 2s atomic shells, while the Ce 5s electrons participate weakly in the chemical bond formation. The composition and the sequent order of the molecular orbitals in the binding energy range of 0 to ∼50 eV were established. A quantitative scheme for the molecular orbitals of CeO2 was built. This scheme is fundamental for understanding the nature of chemical bonding and also for the interpretation of other X-ray spectra of CeO2. Evaluations revealed that the IVMO electrons weaken the chemical bond formed by the OVMO electrons by 37%.

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Recovery and restructuring induced by fission energy ions in high burnup nuclear fuel

Cited by 30 publications

References 12 publications

Redox response of actinide materials to highly ionizing radiation

Redox response of actinide materials to highly ionizing radiation

Review of Swift Heavy Ion Irradiation Effects in CeO2

The electronic structure and the nature of the chemical bond in CeO₂

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Recovery and restructuring induced by fission energy ions in high burnup nuclear fuel

Cited by 30 publications

References 12 publications

Redox response of actinide materials to highly ionizing radiation

Redox response of actinide materials to highly ionizing radiation

Review of Swift Heavy Ion Irradiation Effects in CeO2

The electronic structure and the nature of the chemical bond in CeO2

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Product

Resources

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The electronic structure and the nature of the chemical bond in CeO₂