1. Helium behaviour and vacancy defect distribution in helium implanted tungsten
- Author
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Marie-France Barthe, A. Chelgoum, Hicham Labrim, Thierry Sauvage, R. Belamhawal, Pierre Desgardin, and A. Debelle
- Subjects
Nuclear and High Energy Physics ,Materials science ,Annealing (metallurgy) ,chemistry.chemical_element ,Tungsten ,Fluence ,Molecular physics ,Positron annihilation spectroscopy ,Nuclear physics ,Nuclear Energy and Engineering ,chemistry ,Nuclear reaction analysis ,Vacancy defect ,General Materials Science ,Crystallite ,Helium - Abstract
The distribution and the nature of 3He implantation-induced defects in polycrystalline tungsten samples were studied by Positron Annihilation Spectroscopy as a function of implantation fluence. The implanted helium profile was determined by Nuclear Reaction Analysis, and its evolution under different thermal annealings was investigated. Results show that vacancy-like defects are generated along the path of the ions and that their concentration varies directly as the implantation fluence. No helium desorption was observed under any thermal treatments. However, a change in 3He depth profile under specific annealing conditions suggests the formation of nanometric-size He bubbles.
- Published
- 2007
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