Characterization of vacancy type defects in irradiated UO2 and CeO2

Weber, Marc H.; McCloy, John S.; Halverson, C. R.; Karcher, Sam; Mohun, Ritesh; Corkhill, Claire L.

doi:10.1557/s43580-022-00213-6

Cited by 4 publications

(1 citation statement)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the same time, one of the ways to combat these processes is the stabilization of zirconium ceramics with yttrium or cerium, the addition of which leads to an increase in resistance to radiation damage [31][32][33]. In addition, several works [34][35][36] devoted to studying the radiation resistance of CeO 2 ceramics have shown rather excellent prospects for these materials when used as a basis for creating dispersed nuclear fuel. However, despite the sufficient amount of experimental work in this area, many issues still need to be addressed.…”

Section: Introductionmentioning

confidence: 99%

Study of Radiation-Induced Damage Processes in CeZrO4–YZrO3 Ceramics Caused by Helium Irradiation

et al. 2022

View full text Add to dashboard Cite

Composite oxide ceramics CeZrO4–YZrO3 obtained by mechanochemical synthesis were chosen as objects of study. The most dangerous type of radiation defect in structural materials is associated with helium accumulation in the structure of the near-surface layer. This can lead to the destruction and swelling of the material, resulting in a decrease in its strength and thermal characteristics. During the studies, it was found that the most significant structural changes (deformation of the crystal lattice, the magnitude of microdistortions of the crystal lattice) are observed with irradiation fluence above 5×1016 ion/cm2, while the nature of the changes is exponential. X-ray diffraction analysis found that the nature of the crystal structure deformation has a pronounced type of stretching due to the accumulation of implanted helium and its subsequent agglomeration. A comparative analysis with data on microdistortions of the crystal lattice and the values of microhardness and softening of ZrO2 and CeO2 showed that two-phase ceramics of the cubic type CeZrO4-YZrO3 are more resistant to radiation-induced degradation than single-phase ZrO2 and CeO2. Results of strength and thermophysical characteristics showed that the presence of two phases increases resistance to destruction and disorder, leading to a decrease in strength and thermal conductivity.

show abstract