Systematic analysis on the primary radiation damage in Th1−xUxO2 fluorite systems

Miaomiao Jin, Chao Jiang, Jian Gan, David H. Hurley

Research output: Contribution to journalArticlepeer-review

Abstract

Primary radiation damage featuring rapid atomic collisions and thermal spikes constitutes the foundation of a high-fidelity description of radiation-assisted microstructure evolution. To systematically describe the primary damage in the mixed fuel oxide systems Th1−xUxO2, we consider the effect of temperature, composition, and primary-knock atom energy on defect generation. A holistic functional form is developed to effectively quantify the number of defects, and the exponential truncated power-law can well describe the defect size distribution. Furthermore, the defect (cluster) structures are elaborated, where notably vacancy clusters approach being charge balanced, and interstitial clusters can embrace a high symmetry with a cuboctahedral structure. These results present both a high-level description and a detailed atomic understanding towards radiation-induced defects in fuel oxides, which provides the required input for meso-scale simulations of microstructure evolution.

Original languageEnglish (US)
Article number152144
JournalJournal of Nuclear Materials
Volume536
DOIs
StatePublished - Aug 1 2020

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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