Hydrogen Interaction with Vacancies in Electron Irradiated Niobium

• Authors: J. Čižek , I. Procházka , G. Brauer , W. Anwand , R. Gemma , E. Nikitin , R. Kirchheim , A. Pundt
• Languages of publication: EN

Abstracts

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.

Keywords

EN

78.70.Bj; 61.72.-y

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 61.72.-y: Defects and impurities in crystals; microstructure(for radiation induced defects, see 61.80.-x; for defects in surfaces, interfaces, and thin films, see 68.35.Dv and 68.55.Ln; see also 85.40.Ry Impurity doping, diffusion, and ion implantation technology; for effects of crystal defects and doping on superconducting transition temperature, see 74.62.Dh)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 5
• Pages: 1293-1299

Dates

published

2008-05

received

2007-09-03

Contributors

author

J. Čižek

• Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Praha 8, CZ-180 00, Czech Republic

author

I. Procházka

• Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Praha 8, CZ-180 00, Czech Republic

author

G. Brauer

• Institut fűr Ionenstrahlphysik und Materialforschung, Forschungszentrum Dresden-Rossendorf, Postfach 510119, D-01314, Dresden, Germany

author

W. Anwand

• Institut fűr Ionenstrahlphysik und Materialforschung, Forschungszentrum Dresden-Rossendorf, Postfach 510119, D-01314, Dresden, Germany

author

R. Gemma

• Institut fűr Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077, Göttingen, Germany

author

E. Nikitin

• Institut fűr Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077, Göttingen, Germany

author

R. Kirchheim

• Institut fűr Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077, Göttingen, Germany

author

A. Pundt

• Institut fűr Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077, Göttingen, Germany

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Identifiers

DOI

10.12693/APhysPolA.113.1293