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

Agarwal, Shradha; Chen, Q.; Koyanagi, Takaaki; Zhao, Yajie; Zinkle, Steven J.; Weber, William J.

doi:10.1016/j.jnucmat.2019.151778

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

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Abstract

We present that 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.

Authors:

Agarwal, Shradha ^[1]; Chen, Q. ^[1];

^[2]; Zhao, Yajie ^[1]; Zinkle, Steven J. ^[3];

^[4]

Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Publication Date:: Fri Aug 30 00:00:00 EDT 2019

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Nuclear Energy (NE)

OSTI Identifier:: 1561673

Alternate Identifier(s):: OSTI ID: 1562780

Grant/Contract Number:: AC05-00OR22725; NE0008577

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Nuclear Materials

Additional Journal Information:: Journal Volume: 526; Journal Issue: C; Journal ID: ISSN 0022-3115

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Irradiation damage; Carbon loss; Structural disorder; SiC/SiC composites; Raman spectroscopy

Citation Formats


                    Agarwal, Shradha, Chen, Q., Koyanagi, Takaaki, Zhao, Yajie, Zinkle, Steven J., and Weber, William J. Revealing irradiation damage along with the entire damage range in ion-irradiated SiC/SiC composites using Raman spectroscopy.  United States: N. p., 2019. 
Web.  doi:10.1016/j.jnucmat.2019.151778.

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                    Agarwal, Shradha, Chen, Q., Koyanagi, Takaaki, Zhao, Yajie, Zinkle, Steven J., & Weber, William J. Revealing irradiation damage along with the entire damage range in ion-irradiated SiC/SiC composites using Raman spectroscopy.  United States.  https://doi.org/10.1016/j.jnucmat.2019.151778

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                    Agarwal, Shradha, Chen, Q., Koyanagi, Takaaki, Zhao, Yajie, Zinkle, Steven J., and Weber, William J. Fri .  
"Revealing irradiation damage along with the entire damage range in ion-irradiated SiC/SiC composites using Raman spectroscopy".  United States.  https://doi.org/10.1016/j.jnucmat.2019.151778.  https://www.osti.gov/servlets/purl/1561673.

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@article{osti_1561673,

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

  author       = {Agarwal, Shradha and Chen, Q. and Koyanagi, Takaaki and Zhao, Yajie and Zinkle, Steven J. and Weber, William J.},

  abstractNote = {We present that 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.},

  doi          = {10.1016/j.jnucmat.2019.151778},

  journal      = {Journal of Nuclear Materials},

  number       = C,

  volume       = 526,

  place        = {United States},

  year         = {Fri Aug 30 00:00:00 EDT 2019},

  month        = {Fri Aug 30 00:00:00 EDT 2019}

}

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