Raman spectroscopy study of damage in swift heavy ion-irradiated ceramics
Raman spectroscopy study of damage in swift heavy ion-irradiated ceramics
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DOI：
10.1002/jrs.6414
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发表时间：
2022-07-01
影响因子：
2.5
通讯作者：
Yasuda, Kazuhiro
中科院分区：
文献类型：
--
作者：
Costantini, Jean-Marc;Gutierrez, Gaelle;Yasuda, Kazuhiro
拉曼散射被应用于探测快速重离子辐照陶瓷，即氮化锆（ZrN），氧化铈（CeO2），氧化钇稳定的氧化锆（ZrO 2：Y，或YSZ）的辐射损伤约相同的高电子阻止重离子。拉曼光谱表明，这些陶瓷是耐辐射材料，即使在高注量下的大离子轨道重叠，也不会被这种辐照非晶化。然而，对于ZrN，TA/LA和TO/LO带强度随注量的增加在100-MeV重离子辐照达到3 × 10（12）cm（-2）注量饱和后得到证实。能带的增长归因于轨道内电子激发引起的Zr和N空位浓度的增加。然而，漫反射光谱没有表现出电子结构的任何明显变化。对于氧化铈，在200 MeV~（14）cm~（-2）的能量密度下，观察到类萤石结构的F-2g主峰的降低和加宽，以及氧空位形成的宽缺陷带的增长。对于YSZ，拉曼光谱主要给出了由于原生氧空位导致的本征晶格无序的证据，即使对于200 MeV的I和200 MeV的Au离子辐照，高达约3 × 10（13）cm（-2）的高通量。结果进行了讨论的基础上，在这三种材料中的天然结构的障碍和辐射诱导的电子激发的障碍之间的相互作用。
Raman scattering is applied to probe the radiation damage in swift heavy ion-irradiated ceramics, namely zirconium nitride (ZrN), ceria (CeO2), and yttria-stabilized zirconia (ZrO2: Y, or YSZ) for about the same high electronic stopping power of heavy ions. Raman spectra show that these ceramics are radiation-resistant materials that are not amorphized by such irradiations even for large ion track overlap at high fluences. However, for ZrN, the increase of the TA/LA and TO/LO band intensities versus fluence is evidenced after 100-MeV Xe ion irradiation up to a saturation for the fluence of 3 x 10(12) cm(-2). The band growths are ascribed to the increase of the concentration of Zr and N vacancies induced by electronic excitations inside tracks. However, the diffuse reflectance spectra do not exhibit any clear modifications of the electronic structure. For ceria, the decrease and broadening of the main F-2g peak of the fluorite-like structure and the growth of a broad defect band assigned to oxygen vacancy formation is observed versus fluence up to 10(14) cm(-2) for 200-MeV Xe ion irradiation. For YSZ, Raman spectra mainly give evidence of the intrinsic lattice disorder due to the native oxygen vacancies even up to high fluences of about 3 x 10(13) cm(-2) for 200-MeV I and 200-MeV Au ion irradiation. Results are discussed on the basis of the interplay between the native structural disorder and the radiation-induced disorder by electronic excitations in these three materials.