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This content will become publicly available on April 4, 2019

Title: Ion irradiation induced nucleation and growth of nanoparticles in amorphous silicon carbide at elevated temperatures

Ion irradiation induced crystallization in as-deposited amorphous SiC films is investigated using grazing-angle incidence x-ray diffraction (GIXRD), transmission electron microscopy (TEM) and Raman spectroscopy. Irradiation with 5 MeV Xe to fluence of 1.15 ×10 16 Xe/cm 2 at 700 K results in a homogenous distribution of 3C-SiC grains with an average crystallite size of ~5.7 nm over the entire film thickness (~1 μm). The nucleation and growth processes exhibit a weak dependence on dose in displacements per atom (dpa) in the range from ~6 dpa at the film surface to ~20 dpa at the SiC/Si interface. A transformation of homonuclear C-C bonds from sp 3 to sp 2 hybridization is observed in the irradiated films, which may be partly responsible for the observed grain size saturation. Lastly, the results from this study may have a significant impact on applications of SiC as structural components of advanced nuclear energy systems.
Authors:
 [1] ; ORCiD logo [2] ;  [1] ;  [1] ;  [1]
  1. Lanzhou Univ. (China). School of Nuclear Science and Technology
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
PNNL-SA-130017
Journal ID: ISSN 0022-3115; PII: S0022311517317567
Grant/Contract Number:
11675068; lzujbky-2016-28; AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Name: Journal of Nuclear Materials; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE; National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; Silicon carbide; Crystallization; Ion irradiation
OSTI Identifier:
1432510