Study on lattice defects in CeO<sub>2</sub>by means of positron annihilation measurements

Yamamoto, Yuki; Kishino, T; Ishiyama, Toshio; Iwase, A.; Hori, Fuminobu

doi:10.1088/1742-6596/674/1/012015

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…From a phonon transport perspective, defects on the uranium and oxygen sublattices can influence phonon scattering in significantly different ways. In the case of high energy electron and ion irradiation, defects are generated in the bulk of the samples and traditional PALS was successfully applied to study defects in CeO2 and UO2 using this approach [442]. Additionally, coupling experimental results to a density functional theory description revealed detailed information about the structure of vacancy type defects in UO2.…”

Section: Irradiation-induced Point Defectsmentioning

confidence: 99%

“…In the case of high-energy electron and ion irradiation, defects are generated in the bulk of the samples, and traditional PALS was successfully applied to study defects in CeO 2 and UO 2 using this approach. 442 Additionally, coupling of experimental results to a DFT description revealed detailed information about the structure of vacancy-type defects in UO 2 . Wiktor et al 443 used this approach to reveal that the dominant irradiation-induced defect in 45 MeV alpha-irradiated UO 2 is a bound Schottky defect of neutral V U + 2V O trivacancies.…”

Section: Irradiation-induced Defectsmentioning

confidence: 99%

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Thermal Energy Transport in Oxide Nuclear Fuel

et al. 2021

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To efficiently capture the energy of the nuclear bond, advanced nuclear reactor concepts seek solid fuels that must withstand unprecedented temperature and radiation extremes. In these advanced fuels, thermal energy transport under irradiation is directly related to reactor performance as well as reactor safety. The science of thermal transport in nuclear fuel is a grand challenge due to both computational and experimental complexities. Here, we provide a comprehensive review of thermal transport research on two actinide oxides: one currently in use in commercial nuclear reactors, uranium dioxide (UO2), and one advanced fuel candidate material, thorium dioxide (ThO2). In both materials, 5Concluding Remarks .

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Section: Irradiation-induced Point Defectsmentioning

confidence: 99%

Section: Irradiation-induced Defectsmentioning

confidence: 99%

Thermal Energy Transport in Oxide Nuclear Fuel

et al. 2021

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Near-infrared study of radiation damage in ion-irradiated cerium dioxide and cerium-gadolinium dioxide

Costantini,

Guillaumet,

Lelong

et al. 2025

Nuclear Instruments and Methods in Physics Research Section B:

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Recovery of damage in electron-irradiated ceria

Costantini

Lelong

Guillaumet

et al. 2021

Journal of Applied Physics

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The damage recovery of an electron-irradiated CeO2 single crystal was studied by in situ UV–visible absorption spectroscopy during isochronal thermal annealing up to 873 K. The spectrum of the as-irradiated crystal shows band tailing below the fundamental absorption edge for photon energy near 3.2 eV. Two broad Gaussian bands centered at about 0.9 and 1.4 eV are also recorded. The edge region is treated by including the Urbach edge contribution. The variation of bandgap energy and Urbach energy is followed as a function of the annealing temperature. The absorption edge was red-shifted with annealing temperature then returned to the starting value after cooling back to room temperature. The disorder contribution to the Urbach edge is deduced by subtracting the temperature contribution. It shows a decay of the disorder contribution following a first-order kinetics process with an onset of recovery at 373 K and activation energy of about 0.15 eV. Full recovery is achieved at 873 K, whereas a partial recovery of the two absorption bands (at 0.9 and 1.4 eV) is found. The low activation energy is interpreted in reference to the available literature data on the energy barriers for point defect migration, and assigned to the migration of oxygen interstitials associated to electronic levels near the top of the valence band edge. A recombination mechanism is suggested, involving both electron hopping and interstitial oxygen diffusion.

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Study on lattice defects in CeO₂by means of positron annihilation measurements

Cited by 4 publications

References 11 publications

Thermal Energy Transport in Oxide Nuclear Fuel

Thermal Energy Transport in Oxide Nuclear Fuel

Near-infrared study of radiation damage in ion-irradiated cerium dioxide and cerium-gadolinium dioxide

Recovery of damage in electron-irradiated ceria

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Study on lattice defects in CeO2by means of positron annihilation measurements

Cited by 4 publications

References 11 publications

Thermal Energy Transport in Oxide Nuclear Fuel

Thermal Energy Transport in Oxide Nuclear Fuel

Near-infrared study of radiation damage in ion-irradiated cerium dioxide and cerium-gadolinium dioxide

Recovery of damage in electron-irradiated ceria

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Study on lattice defects in CeO₂by means of positron annihilation measurements