Hydrogen-Induced Defects in Palladium
Hydrogen-Induced Defects in Palladium
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DOI：
10.12693/aphyspola.125.752
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发表时间：
2014-03
影响因子：
0.7
通讯作者：
O. Melikhova;J. Čížek;I. Procházka
中科院分区：
文献类型：
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作者：
O. Melikhova;J. Čížek;I. Procházka
在目前的工作中，正电子湮没光谱用于研究钯中氢致缺陷。对退火良好的 Pd 样品进行电化学充电，并研究了随着氢浓度 xH 的增加缺陷的发展。在低浓度（α相，xH < 0.017 H/Pd）下，氢负载引入了空位，因为吸收的氢在空位处偏析显着降低了空位形成能。当氢浓度超过0.017H/Pd时，形成氢化钯(PdH)颗粒。生长的 PdH 颗粒引起的应力会导致塑性变形，从而在样品中产生位错和空位。 DOI：10.12693/APhysPolA.125.752 PACS：78.70.Bj，61.72.−y
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: 78.70.Bj, 61.72.−y