Microstructural Evolution in Cerium Dioxide Irradiated with Heavy Ions at High Temperature

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  • Mihara Takeshi
    Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo
  • Abe Hiroaki
    Nuclear Professional School, School of Engineering, The University of Tokyo
  • Sonoda Takeshi
    Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI)

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  • 高温イオン照射した酸化セリウムの組織変化
  • コウオン イオン ショウシャシタ サンカ セリウム ノ ソシキ ヘンカ

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Abstract

  Formation of subdivided grains and coarsened bubbles in uranium dioxides under high burn-up conditions in nuclear power plants deteriorate the performance of nuclear fuels. To clarify its mechanism, heavy ion irradiations in cerium dioxide followed by Raman spectroscopy, X-ray diffractometry and electron microscopy (SEM) were performed. At the early stage of irradiations, increase in the lattice constant and shift in the F2g peak position were observed presumably indicating accumulation of oxygen vacancies. Further irradiation enhanced recombination or clustering of vacancies depending on the irradiation temperature. The behaviors affect the surface morphology of the sample as well. Especially above 1000K, characteristic changes in Raman spectra and surface features were detected, presumably attributable to remarkable diffusion of vacancies. The relation between displacement of F2g position and electronic energy deposition of incident ions was observed, suggesting the role of electronic excitations on the formation of oxygen vacancies in cerium dioxide.<br>

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