Effect of purity on the vacancy defects induced in selfirradiated tungsten: a combination of PAS and TEM
| Autor: | C. Genevois, P. Desgardin, Z. Hu, Marie-France Barthe, Robin Schäublin, B. Décamps, J. Joseph |
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| Přispěvatelé: | Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Barthe, Marie-France |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Analytical chemistry chemistry.chemical_element 02 engineering and technology Trapping Tungsten 01 natural sciences Ion Positron annihilation spectroscopy light-element impurities Impurity Vacancy defect 0103 physical sciences [CHIM] Chemical Sciences [CHIM]Chemical Sciences General Materials Science Irradiation 010306 general physics self-irradiation vacancy-complexes 021001 nanoscience & nanotechnology Nuclear Energy and Engineering chemistry Transmission electron microscopy TEM 0210 nano-technology |
| Zdroj: | Journal of Nuclear Materials Journal of Nuclear Materials, Elsevier, 2021 HAL |
| ISSN: | 0022-3115 |
| Popis: | International audience; Vacancy defects in tungsten induced by self-irradiation were characterized by positron annihilation spectroscopy (PAS) and transmission electron microscopy (TEM). Taking advantage of their complementarity, defects ranging from single vacancies up to vacancy clusters were detected, and the effects of sample purity (99.95 wt.% and 99.9999 wt.%) on their formation and evolution under low damage dose(0.01 to 0.02 dpa)irradiation with 20 and 1.2 MeV-W ions were studied at room temperature (RT), 500 and 700 °C respectively. When irradiation was performed at RT, PAS probed mainly single vacancies. At high irradiation temperatures, larger vacancy clusters were detected by both techniques. Both PAS and TEM revealed larger vacancy clusters in the purest samples after irradiation at 500 and 700 °C. A significant difference in the evolution of vacancy-type defects related to sample purity was observed. In view of the properties (migration, trapping) of some light-element impurities (LEs), present at high concentrations, determined by first-principles calculation, it is reasonable to assign the effect of purity during the irradiation response to the formation of vacancyimpurity complexes, which is critical for the understanding of the behavior of tungsten in the future fusion reactor. |
| Databáze: | OpenAIRE |
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