Recovery of hydrogen induced defects and thermal desorption of residual hydrogen in LaNi5 : Special issue on grain boundaries, interfaces, defects and localized quantum structures in ceramics
Recovery of hydrogen induced defects and thermal desorption of residual hydrogen in LaNi5 : Special issue on grain boundaries, interfaces, defects and localized quantum structures in ceramics
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LaNi5 中氢致缺陷的恢复和残余氢的热解吸：陶瓷中晶界、界面、缺陷和局域量子结构的特刊
DOI：
10.2320/matertrans.43.1494
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Y. Shirai
中科院分区：
文献类型：
--
作者：
K. Sakaki;H. Araki;Y. Shirai
用正电子寿命谱和氢热脱附测量方法研究了LaNi 5中初始退火引起的晶格缺陷及其对残余氢含量的影响。正电子寿命谱的成分分析表明，初始退火产生了大量的空位和位错。室温下，在423-673 K之间观察到LaNi 5中的空位迁移，而位错则稳定得多。氢的热脱附测量表明，残余氢的释放主要发生在450 ~ 650 K之间，在800 K左右停止。LaNi 5中残余氢的释放温度与空位迁移和湮没温度密切对应。LaNi 5中的残余氢很可能被空位和空位团所捕获，这些空位和空位团是由退火引起的。
Lattice defects induced by initial hydriding and their effect on residual hydrogen content in LaNi 5 have been studied by means of positron lifetime spectroscopy and hydrogen thermal desorption measurement. Component analyses of positron lifetime spectra show that surprising amount of vacancies together with dislocations are generated by the initial hydriding. Vacancy migration in LaNi 5 after hydrogen desorption at room temperature is observed around 423-673 K, while dislocations in LaNi 5 are much more stable. Hydrogen thermal desorption measurement shows that the release of residual hydrogen occurs mainly in the temperature range from 450 to 650 K, and it ceases at about 800 K. The release temperature of residual hydrogen closely corresponds with the temperature of vacancy migration and annihilation in LaNi 5 . Residual hydrogen in LaNi 5 is most likely trapped by vacancies and vacancy clusters, which are induced by hydriding.