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Positron annihilation study of lattice defects induced by hydrogen absorption in some hydrogen storage materials

qingping999_0 添加于 2010-6-1 10:31 | 1487 次阅读 | 0 个评论

作者
Shirai Y
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.
详细资料
- 文献种类: Journal Article
- 期刊名称: Journal of Alloys and Compounds
- 期卷页: 第330-332卷第1-2期 125-131页
- ISBN: 0925-8388
学科领域工程技术 » 材料科学
标签

Positron annihilation
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