Hydrogen-Induced Defects in Palladium

• Authors: O. Melikhova , J. Čížek , I. Procházka
• Languages of publication: EN

Abstracts

EN

In the present work positron annihilation spectroscopy was employed for investigation of hydrogen-induced defects in Pd. Well annealed Pd samples were electrochemically charged with hydrogen and development of defects with increasing hydrogen concentration x_{H} was investigated. At low concentrations (α-phase, x_{H} < 0.017 H/Pd) hydrogen loading introduced vacancies, since absorbed hydrogen segregating at vacancies lowers remarkably the vacancy formation energy. When hydrogen concentration exceeds 0.017 H/Pd, particles of palladium hydride (PdH) are formed. Stress induced by growing PdH particles leads to plastic deformation which generates dislocations and vacancies in the sample.

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: 2014
• Volume: 125
• Issue: 3
• Pages: 752-755

Dates

published

2014-03

Contributors

author

O. Melikhova

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

author

J. Čížek

• 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

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Identifiers

DOI

10.12693/APhysPolA.125.752