Hydrogen-Induced Defects in Palladium
O. Melikhova, J. Čížek and 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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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 xH was investigated. At low concentrations (α-phase, xH < 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.

DOI: 10.12693/APhysPolA.125.752
PACS numbers: 78.70.Bj, 61.72.-y