Vacancy recovery and vacancy-hydrogen interaction in niobium and tantalum studied by positrons

P. Hautojarvi*, H. Huomo, M. Puska, A. Vehanen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

56 Citations (Scopus)
117 Downloads (Pure)

Abstract

Positron-lifetime measurements in electron-irradiated pure Nb and Ta show that monovacancy migration occurs at 220 and 260 K, respectively. Hydrogen impurities can be bound to vacancies, as is experimentally observed in Ta at 70 K after low-temperature ±-particle irradiation. The vacancy-hydrogen complex formation shifts the vacancy migration to higher temperatures. Vacancy hydrogen complexes retain the capability to trap positrons. Theoretical calculations performed for hydrogen and positron states at vacancies are in agreement with experimental findings.
Original languageEnglish
Pages (from-to)4326-4331
Number of pages6
JournalPhysical Review B
Volume32
Issue number7
DOIs
Publication statusPublished - 1 Oct 1985
MoE publication typeA1 Journal article-refereed

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