Near-infrared study of radiation damage in ion-irradiated cerium dioxide and cerium-gadolinium dioxide

Costantini, J.-M.*; Guillaumet, M.*; Lelong, G.*; Ishikawa, Norito ; Seo, P.*; Yasuda, Kazuhiro*

Radiation damage is studied in ion-irradiated sintered CeO $_{2}$ and (Ce, Gd)O $_{2-x}$ samples. Near Infra-red (NIR) spectra measurements were carried out by using the diffuse reflectivity mode for all of these sintered samples. Samples were irradiated with 100-MeV Kr, 200-MeV Xe, and 36-MeV W ions. Four broad absorption bands centered at 3700, 4100, 6000, and 7600 cm $^{-1}$ (i.e. 0.46, 0.51, 0.74, and 0.94 eV) are deduced from fits of the FTIR spectra for the ion-irradiated CeO $_{2}$ and (Ce, Gd)O $_{2-x}$ samples accompanied by a change in color from ivory to green. No such bands are recorded for the virgin (Ce, Gd)O $_{2-x}$ samples with 5, 10, and 15 mol Gd $_{2}$ O $_{3}$ with an increasing amount of oxygen vacancies. Absorption bands are tentatively assigned to electronic transitions involving cerium vacancy levels in the band gap, which has been also observed under high-energy electron irradiation.

Language	:	English
Journal	:	Nuclear Instruments and Methods in Physics Research B
Volume	:	558
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Pages	:	p.165567_1 - 165567_6
Publication Year/Month	:	2025/01
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Paper URL	:	https://doi.org/10.1016/j.nimb.2024.165567
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Keywords	:	no keyword
Research Facility	:	タンデム加速器
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Registration No. : AA20250004
JAEA Abstracts No. : 53001135
Paper Submission No. : 30020

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