Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 526, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2019.151778
Keywords
Irradiation damage; Carbon loss; Structural disorder; SiC/SiC composites; Raman spectroscopy
Funding
- U.S. Department of Energy, Office of Nuclear Energy's Nuclear Energy University Program [DE-NE0008577]
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Incorporating Raman spectroscopy with transverse lift-out specimens is demonstrated to effectively characterize depth-dependent ion-irradiation damage in nuclear ceramics, such as SiC/SiC composites irradiated up to 1, 10 and 50 displacements per atom (dpa) at 350 degrees C using 10 MeV Au ions. Raman spectroscopy reveals irradiation-induced structural disorder saturation in both SiC-fiber and SiC-matrix at doses as low as 1 dpa, despite vastly different microstructures, inferred from similar longitudinal optical (LO) and transverse optical (TO) phonon peak shifts. Diamond (D) and graphitic (G) peaks from SiC-fibers disappear under irradiation, revealing irradiation-induced carbon packet loss. The irradiation-induced carbon packet loss is also verified by conducting TEM on same FIB foils used for Raman spectroscopy. In a previous study, the irradiation-induced SiC-fiber shrinkage is known to occur due to carbon packet loss in fibers. (C) 2019 Elsevier B.V. All rights reserved.
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