Direct observation of mono-vacancy and self-interstitial recovery in tungsten

J. Heikinheimo, K. Mizohata, J. Räisänen, T. Ahlgren, P. Jalkanen, A. Lahtinen, N. Catarino, E. Alves, F. Tuomisto

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Reliable and accurate knowledge of the physical properties of elementary point defects is crucial for predictive modeling of the evolution of radiation damage in materials employed in harsh conditions. We have applied positron annihilation spectroscopy to directly detect mono-vacancy defects created in tungsten through particle irradiation at cryogenic temperatures, as well as their recovery kinetics. We find that efficient self-healing of the primary damage takes place through Frenkel pair recombination already at 35 K, in line with an upper bound of 0.1 eV for the migration barrier of self-interstitials. Further self-interstitial migration is observed above 50 K with activation energies in the range of 0.12-0.42 eV through the release of the self-interstitial atoms from impurities and structural defects and following recombination with mono-vacancies. Mono-vacancy migration is activated at around 550 K with a migration barrier of EmV=1.85±0.05 eV.

Original languageEnglish
Article number021103
JournalAPL Materials
Volume7
Issue number2
DOIs
Publication statusPublished - Feb 2019
MoE publication typeA1 Journal article-refereed

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Tungsten
Vacancies
Recovery
Positron annihilation spectroscopy
Defects
Radiation damage
Point defects
Cryogenics
Activation energy
Physical properties
Irradiation
Impurities
Atoms
Kinetics
Temperature

Cite this

Heikinheimo, J., Mizohata, K., Räisänen, J., Ahlgren, T., Jalkanen, P., Lahtinen, A., ... Tuomisto, F. (2019). Direct observation of mono-vacancy and self-interstitial recovery in tungsten. APL Materials, 7(2), [021103]. https://doi.org/10.1063/1.5082150
Heikinheimo, J. ; Mizohata, K. ; Räisänen, J. ; Ahlgren, T. ; Jalkanen, P. ; Lahtinen, A. ; Catarino, N. ; Alves, E. ; Tuomisto, F. / Direct observation of mono-vacancy and self-interstitial recovery in tungsten. In: APL Materials. 2019 ; Vol. 7, No. 2.
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Heikinheimo, J, Mizohata, K, Räisänen, J, Ahlgren, T, Jalkanen, P, Lahtinen, A, Catarino, N, Alves, E & Tuomisto, F 2019, 'Direct observation of mono-vacancy and self-interstitial recovery in tungsten', APL Materials, vol. 7, no. 2, 021103. https://doi.org/10.1063/1.5082150

Direct observation of mono-vacancy and self-interstitial recovery in tungsten. / Heikinheimo, J.; Mizohata, K.; Räisänen, J.; Ahlgren, T.; Jalkanen, P.; Lahtinen, A.; Catarino, N.; Alves, E.; Tuomisto, F.

In: APL Materials, Vol. 7, No. 2, 021103, 02.2019.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Räisänen, J.

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Heikinheimo J, Mizohata K, Räisänen J, Ahlgren T, Jalkanen P, Lahtinen A et al. Direct observation of mono-vacancy and self-interstitial recovery in tungsten. APL Materials. 2019 Feb;7(2). 021103. https://doi.org/10.1063/1.5082150