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Hydrogen Interaction with Vacancies in Electron Irradiated Niobium

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Čižek J., Procházka I., Brauer G., Anwand W., Gemma R., Nikitin E., Kirchheim R., Pundt A.
Acta Physica Polonica A
|
2008
|
vol. 113
|
issue 5
1293-1299
EN
Defect studies of Nb irradiated with 10 MeV electrons were performed in the present work by means of positron annihilation spectroscopy. The lattice defects were characterized by positron lifetime spectroscopy. Moreover, defect depth profiles were studied by slow positron implantation spectroscopy. The experimental investigations were accompanied by first principles theoretical calculations of positron parameters. It was found that irradiation-induced vacancies in Nb specimens are surrounded by H, which causes a shortening of the lifetime of trapped positrons. The influence of a Pd and Cr over-layer on the H concentration in the Nb specimens was examined.
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