NRA and ERDA Investigation of Helium Retention in SiC as a Function of Irradiation and Annealing
Silicon carbide has been proposed for coating applications in advanced reactor designs, so studies of its behavior in the presence of ion irradiation and fission products are of Interest. We investigated the retention of He in single crystal 6H SiC as a function of irradiation dose and annealing temperature using both nuclear reaction analysis (NRA) and time-of-flight elastic recoil detection analysis (ToF ERDA). Ions of {sup 3}He{sup +} were implanted at 40 keV in SiC to a depth of {approx}200 nm at room temperature. NRA was performed using 1.0 MeV D{sup p+} and the {sup 3}He(D,{alpha}){sup 1}H reaction. No change in the He profile was seen for irradiation dose up to 6.8 x 10{sup 17} D{sup +}/cm{sup 2} at room temperature. Isochronal annealing of the SiC between 300 and 1200 K also showed no significant helium loss. Subsequently, a sample was irradiated with D{sup +} at 900 K and again at 1100 K. No loss of {sup 3}He associated with irradiation was seen for a dose up to 5 x 10{sup 17} D{sup +}/cm{sup 2}. Annealing the sample above 1200 K resulted in thermally activated loss of He. ToF ERDA measurements were performed using 44 MeV {sup 127}I{sup 10+} for both irradiation and analysis. Depth profiles of the He distribution showed no significant change under I bombardment with an ion fluence up to {approx}10{sup 14}/cm{sup 2} at room temperature. NRA was performed on the implanted sample subjected to ERDA. The {sup 3}He profiles for regions subjected to I irradiation were similar in shape to those with no I irradiation.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15010581
- Report Number(s):
- PNNL-SA-39452; 3448; KC0201020
- Journal Information:
- Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 219-220(631-635, Journal Name: Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, 219-220(631-635
- Country of Publication:
- United States
- Language:
- English
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