Interaction of hydrogen and vacancies in copper investigated by positron annihilation
- 1 August 1978
- journal article
- Published by IOP Publishing in Journal of Physics F: Metal Physics
- Vol. 8 (8) , 1691-1698
- https://doi.org/10.1088/0305-4608/8/8/010
Abstract
Doppler broadening measurements have been performed on Cu samples containing vacancies and/or hydrogen. Trapping of hydrogen by vacancies is indicated above about 150K. Vacancies occupied by hydrogen show a strongly reduced positron-trapping probability as compared to hydrogen-free vacancies. Detrapping of hydrogen is not observed below 450K. Therefore, the vacancy-hydrogen binding energy must be greater than 0.4 eV. The positron measurements also show that quenched-in vacancies become mobile at about 273K and form clusters. The close analogy to the annealing behaviour of electron-irradiated Cu confirms the interpretation of annealing stage III by single-vacancy migration.Keywords
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