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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Positron annihilation study of lattice defects induced by hydrogen absorption in some hydrogen storage materials
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Positron annihilation study of lattice defects induced by hydrogen absorption in some hydrogen storage materials

机译：正电子ni灭研究某些储氢材料中氢吸收引起的晶格缺陷

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摘要

Some AB_5 and AB_2 hydrogen storage compounds have been characterized by using positron-annihilation lifetime spectroscopy. It has been shown that they contain no constitutional vacancies and that deviations from the stoichiometric compositions are all compensated by antistructure atoms. Positron lifetimes in fully-annealed LaNi_(5-x)Al_x and MmNi_(5-x)Al_x alloys show good correlation with their hydrogen desorption pressures. On the other hand, surprising amounts of vacancies together with dislocations have been found to be generated during the first hydrogen absorption process of LaNi_5 and ZrMn_2. These lattice defects may play a key role in initial activation processes of hydrogen storage materials.
机译：一些AB_5和AB_2储氢化合物已通过使用正电子an没寿命光谱进行了表征。已经表明，它们不包含结构空位，并且与化学计量组成的偏差均由反结构原子补偿。在完全退火的LaNi_（5-x）Al_x和MmNi_（5-x）Al_x合金中，正电子寿命与氢解吸压力具有良好的相关性。另一方面，已经发现在LaNi_5和ZrMn_2的第一个氢吸收过程中产生了惊人数量的空位以及位错。这些晶格缺陷可能在储氢材料的初始活化过程中起关键作用。

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