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

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2024-11-10 DOI:10.1016/j.nimb.2024.165567

Jean-Marc Costantini , Maxime Guillaumet , Gérald Lelong , Norito Ishikawa , Pooreun Seo , Kazuhiro Yasuda

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Abstract

Radiation damage is studied in ion-irradiated sintered CeO₂ and (Ce, Gd)O_2-x samples. Near Infra-red (NIR) spectra were recorded at room temperature for wavenumbers between 2800 and 11,000 cm⁻¹ (i.e. ∼0.9–3.57 µm in wavelength and ∼0.35–1.36 eV in photon energy). 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 up to 1 × 10¹⁴ cm⁻². A sintered (Ce, Gd)O_2-x sample for 5 mol% Gd₂O₃ was also irradiated with 12-MeV Ar ions at 2 × 10¹⁴ cm⁻². 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 sintered CeO₂ 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% Gd₂O₃ with an increasing amount of oxygen vacancies. Absorption bands are tentatively assigned to electronic transitions involving cerium vacancy levels in the band gap, also observed under high-energy electron irradiation. The possible effects of either electronic excitations or nuclear collisions in this damage process are discussed.

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离子辐照二氧化铈和二氧化钆铈中辐射损伤的近红外研究

研究了离子辐照烧结 CeO2 和 (Ce, Gd)O2-x 样品的辐射损伤。在室温下记录了波长在 2800 至 11,000 cm-1 之间（即波长为 ∼0.9-3.57 µm，光子能量为 ∼0.35-1.36 eV）的近红外光谱。所有这些烧结样品都采用漫反射模式进行测量。样品受到 100-MeV Kr、200-MeV Xe 和 36-MeV W 离子的辐照，能量达到 1 × 1014 cm-2。还用 12-MeV Ar 离子以 2 × 1014 cm-2 的能量辐照了含 5 mol% Gd2O3 的烧结 (Ce, Gd)O2-x 样品。通过拟合离子辐照烧结 CeO2 和 (Ce, Gd)O2-x 样品的傅立叶变换红外光谱，可以推断出以 3700、4100、6000 和 7600 cm-1 为中心的四条宽吸收带（即 ∼ 0.46、0.51、0.74 和 0.94 eV），同时颜色从象牙色变为绿色。含 5、10 和 15 mol% Gd2O3 的原始 (Ce, Gd)O2-x 样品没有记录到此类吸收带，但氧空位的数量在不断增加。吸收带被初步归结为涉及带隙中铈空位的电子跃迁，在高能电子辐照下也能观察到。讨论了电子激发或核碰撞在这一破坏过程中可能产生的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms 物理-核科学技术

CiteScore

2.80

自引率

7.70%

发文量

231

审稿时长

1.9 months

期刊介绍： Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.