Revealing irradiation damage along with the entire damage range in ion-irradiated SiC/SiC composites using Raman spectroscopy

S. Agarwal; Q. Chen; T. Koyanagi; Y. Zhao; S. J. Zinkle; W. J. Weber

doi:10.1016/j.jnucmat.2019.151778

Revealing irradiation damage along with the entire damage range in ion-irradiated SiC/SiC composites using Raman spectroscopy

S. Agarwal, Q. Chen, T. Koyanagi, Y. Zhao, S. J. Zinkle, W. J. Weber

Radiation Effects and Microstructural An

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29 Scopus citations

Abstract

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 °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.

Original language	English
Article number	151778
Journal	Journal of Nuclear Materials
Volume	526
DOIs	https://doi.org/10.1016/j.jnucmat.2019.151778
State	Published - Dec 1 2019

Funding

This work was supported in part by the U.S. Department of Energy, Office of Nuclear Energy's Nuclear Energy University Program under grant DE-NE0008577 .

Funders	Funder number
U.S. Department of Energy
Office of Nuclear Energy
Nuclear Energy University Program	DE-NE0008577

Keywords

Carbon loss
Irradiation damage
Raman spectroscopy
SiC/SiC composites
Structural disorder

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10.1016/j.jnucmat.2019.151778

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title = "Revealing irradiation damage along with the entire damage range in ion-irradiated SiC/SiC composites using Raman spectroscopy",

abstract = "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 °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.",

keywords = "Carbon loss, Irradiation damage, Raman spectroscopy, SiC/SiC composites, Structural disorder",

author = "S. Agarwal and Q. Chen and T. Koyanagi and Y. Zhao and Zinkle, {S. J.} and Weber, {W. J.}",

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AU - Agarwal, S.

AU - Chen, Q.

AU - Koyanagi, T.

AU - Zhao, Y.

AU - Zinkle, S. J.

AU - Weber, W. J.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - 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 °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.

AB - 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 °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.

KW - Carbon loss

KW - Irradiation damage

KW - Raman spectroscopy

KW - SiC/SiC composites

KW - Structural disorder

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Revealing irradiation damage along with the entire damage range in ion-irradiated SiC/SiC composites using Raman spectroscopy

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