Energetics of defect production in fluorite-structured 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CeO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
 induced by highly ionizing radiation

Shelyug, Anna; Palomares, Raul I.; Lang, Maik; Navrotsky, Alexandra

doi:10.1103/physrevmaterials.2.093607

Cited by 12 publications

(26 citation statements)

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“…Dislocation loops have been observed in SHI irradiated CeO2 above a threshold stopping power of 12 keV/nm [40]. XAS and XPS measurements on SHI irradiated CeO2 reveal that structural changes are accompanied by partial reduction of nominally Ce 4+ cations to Ce 3+ [34,39,47,52,55,59]. XAS spectra show a shift in the K-edge absorption energy of approximately −2 eV (Figure 3b), which suggests a partial reduction to the trivalent state rather than the transition of all cerium cations to the trivalent state, which corresponds to a shift of −7 eV [65].…”

Section: Radiation Effects In Ceomentioning

confidence: 95%

“…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%

“…Spectroscopic techniques provide insight into the local damage structure and changes to the chemistry of irradiated materials. X-ray absorption spectroscopy (XAS) has been used to probe cation oxidation state changes in irradiated CeO 2 and associated modifications to the local bonding environment [35,47,55,61,62]. X-ray photoelectron spectroscopy (XPS) provides insight into the electronic structure of cations by X-ray induced electron excitation and the consequent emission of characteristic photons during de-excitation [34,35,52,59].…”

Section: Characterizationmentioning

confidence: 99%

“…Impact on Structure and Chemistry DSC measurements on SHI irradiated CeO 2 by Shelyug et al [54] revealed that onlỹ 1% of the energy deposited by ions is subsequently stored in irradiation-induced defects within the structure. XRD measurements of irradiated samples display distinct changes in Bragg peak position, intensity, and width in CeO 2 after SHI irradiation, indicative of unit cell expansion and an increase in structural distortions around defects (microstrain) (Figure 3a) [14,36,38,39,41,[46][47][48]53,55,57,60,61]. The original fluorite structure peaks are retained, and no diffuse scattering is apparent, indicating a very high resistance to irradiation-induced amorphization.…”

Section: Radiation Effects In Ceomentioning

confidence: 99%

“…While changes in unit cell parameter and microstrain of CeO2 (Figure 3a) follow a behavior that is consistent with a single impact model [31,47] (Equation ( 3)), it remains unclear whether or not the induced redox changes follow the same trend. XPS data from Iwase et al [34] suggest a single impact mechanism for redox effects, based on the increase XAS and XPS measurements on SHI irradiated CeO 2 reveal that structural changes are accompanied by partial reduction of nominally Ce 4+ cations to Ce 3+ [34,39,47,52,55,59]. XAS spectra show a shift in the K-edge absorption energy of approximately −2 eV (Figure 3b), which suggests a partial reduction to the trivalent state rather than the transition of all cerium cations to the trivalent state, which corresponds to a shift of −7 eV [65].…”

Section: Radiation Effects In Ceomentioning

confidence: 99%

See 4 more Smart Citations

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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Section: Radiation Effects In Ceomentioning

confidence: 95%

Section: Characterizationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Radiation Effects In Ceomentioning

confidence: 99%

Section: Radiation Effects In Ceomentioning

confidence: 99%

See 3 more Smart Citations

Review of Swift Heavy Ion Irradiation Effects in CeO2

Cureton

Tracy

Lang

2021

QuBS

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Fundamental Phenomena and Applications of Swift Heavy Ion Irradiations

Lang

Djurabekova

Medvedev

et al. 2020

Comprehensive Nuclear Materials

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This review concentrates on the specific properties and characteristics of damage structures generated with high-energy ions in the electronic energy loss regime. Irradiation experiments with so-called swift heavy ions (SHI) find applications in many different fields, with examples presented in ion-track nanotechnology, radiation hardness analysis of functional materials, and laboratory tests of cosmic radiation. The basics of the SHI-solid interaction are described with special attention to processes in the electronic subsystem. The broad spectrum of damage phenomena is exemplified for various materials and material classes, along with a description of typical characterization techniques. The review also presents state-of-the-art modeling efforts that try to account for the complexity of the coupled processes of the electronic and atomic subsystems. Finally, the relevance of SHI phenomena for effects induced by fission fragments in nuclear fuels and how this knowledge can be applied to better estimate damage risks in nuclear materials is discussed.

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