2022 Fiscal Year Annual Research Report

A study on the synergetic effect of electronic excitation/dislocation damage by in-situ measurement method under irradiation

Research Project

Project/Area Number	21J13575
Research Institution	Kyushu University
Principal Investigator	SEO POOREUN 九州大学, 工学府, 特別研究員(DC2)
Project Period (FY)	2021-04-28 – 2023-03-31
Keywords	Ceramic oxides / Irradiation / Point defect / HVEM / Radiation damage / Nuclear material / Cathodoluminescence
Outline of Annual Research Achievements	Gd2O3 doped CeO2 (GDC)is a fluorite sturcture which is a radiation-resistant oxides. This oxide can be a substitute of the nuclear fuel, such as (U,Gd)O2.GDC has nature oxygen vacancies (VOs) generated by reduction of CeO2-x or substitution of Gd3+ ion to Ce4+ ion site, resulting in a cooperative impact that aids in the restoration of radiation damage.The GDC is examined by varying Gd dopant concentration, and they were exposed to heavy ions at high ion fluences to determine the impact of VOs and its stuructue evaluation.To assess the extent of disordering caused by these factors, both virgin and irradiated samples were analyzed on long- and medium-range scales, and images of the affected areas were examined using TEM.In-situ cathodoluminescence spectroscopy under high-energy electron irradiation were also analyzed to determine the charge states of VOs in the beam condition.
Research Progress Status	令和4年度が最終年度であるため、記入しない。
Strategy for Future Research Activity	令和4年度が最終年度であるため、記入しない。