[2C01-07] Irradiation Effect 1

[2C04] In-situ cathodoluminescence study of Gd₂O₃ doped CeO₂ in HVEM

*Pooreun SEO¹, A.K.M. Saiful Islam BHUIAN², Jean-Marc COSTANTINI³, Syo MATSUMURA¹, Kazuhiro YASUDA¹ (1. Kyushu Univ., 2. BAEC, 3. CEA, Univ. Paris-Saclay)

Keywords:Gd2O3 doped CeO2, Irradiation effects, High voltage electron microscopy, In-situ luminescence

Understanding the production of point defect and its charge state under irradiation condition is crucial to evaluate the safety of nuclear materials. CeO₂ (ceria) is a surrogate for plutonium oxide and transmutation target and Gd₂O₃ doped ceria (GDC) can be used for burnable absorber fuels by neutron capture on large cross sections of Gd isotopes (Gd¹⁵⁵ and Gd¹⁵⁷). We detected in-situ cathodoluminescence (CL) emitted from F centers (oxygen vacancies with trapped electrons) and cerium ions in GDC varying with Gd concentration under high energy electron irradiation by using high voltage electron microscopy (HVEM) for 100 K ~ 300 K sample temperatures. We interpreted CL spectra in GDC showing 3 broad bands with thermal and concentration quenching effects.