Hydrogen induced vacancy formation in tungsten

Middleburgh, Simon C.; Воскобойников, Р. Е.; Guenette, Mathew C.; Riley, Daniel P.

doi:10.1016/j.jnucmat.2014.02.014

Cited by 50 publications

(37 citation statements)

References 93 publications

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“…Indeed, it has been already demonstrated by [17] and classical Molecular Dynamics [18] that HIs The resulting simulated TDS spectrum presented in fig. 1 (b) shows 2 desorption peaks at 420 K and 630 K which correspond well with the experimental measurement.…”

Section: Resultsmentioning

confidence: 79%

Study of hydrogen isotopes behavior in tungsten by a multi trapping macroscopic rate equation model

Hodille¹,

Ferro²,

Fernández³

et al. 2016

Phys. Scr.

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Density Functional Theory studies show that in tungsten a mono vacancy can contain up to 6 Hydrogen Isotopes (HIs) at 300K with detrapping energies varying with the number of HIs in the vacancy. Using these predictions, a multi trapping rate equation model has been built and used to model thermal desorption spectrometry (TDS) experiments performed on single crystal tungsten after deuterium ions implantation. Detrapping energies obtained from the model to adjust temperature of TDS spectrum observed experimentally are in good agreement with DFT values within a deviation below 10 %. The desorption spectrum as well as the diffusion of deuterium in the bulk are rationalized in light of the model results.

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Section: Resultsmentioning

confidence: 79%

Study of hydrogen isotopes behavior in tungsten by a multi trapping macroscopic rate equation model

Hodille¹,

Ferro²,

Fernández³

et al. 2016

Phys. Scr.

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show abstract

“…Furthermore, it has been reported that solute H reduces the vacancy formation energy in W by up to 25 % for extreme solute H concentrations [44] thus further facilitating formation of Frenkel pairs. In addition, vacancies appear to have an attractive interaction in the presence of solute H so that the clustering of vacancies into larger vacancy complexes seems possible [44,45]. Eventually this postulated process could lead to the evolution of larger defect structures.…”

Section: Resultsmentioning

confidence: 99%

Deuterium supersaturation in low-energy plasma-loaded tungsten surfaces

et al. 2016

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Fundamental understanding of hydrogen-metal interaction is challenging due to lack of knowledge on defect production and/or evolution upon hydrogen ingression, especially for metals undergoing hydrogen irradiation with ion energy below the reported displacement thresholds from literature. Here, applying a novel low-energy argon-sputter depth-profiling method with significantly improved depth resolution for tungsten (W) surfaces exposed to deuterium (D) plasma at 300 K, we show the existence of a 10-nm-thick D-supersaturated surface layer (DSSL) with an unexpectedly high D concentration of ~ 10 at. % after irradiation with ion energy of 215 eV. Electron back-scatter diffraction reveals that the W lattice within this DSSL is highly distorted thus strongly blurring the Kikuchi pattern. We explain the strong damage by the synergistic interaction of the energetic D ions and solute D atoms with the W lattice. Solute D atoms prevent the recombination of vacancies with interstitial W atoms, which are produced by the collisions of energetic D ions with W lattice atoms (Frenkel pairs). This proposed damaging mechanism could also be active on other hydrogen-irradiated metal surfaces. The present work provides a deep insight into hydrogen-induced lattice distortion at plasma-metal interfaces and sheds light on its modelling work.

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“…The set-up is described in detail in [19]. We measured the proton signal at single 3 Measurements were performed along the longer Y axis of samples, the same Y axis as on figure 3, in the centre of the shorter X axis. We can observe that the proton signal increases substantially in the middle of the sample which is the area where W ion damaging was performed and is approximately 5 mm wide.…”

Section: Nra and Tds Analysismentioning

confidence: 99%

Displacement damage stabilization by hydrogen presence under simultaneous W ion damage and D ion exposure

et al. 2019

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Polycrystalline tungsten (W) samples were simultaneously irradiated by 10.8 MeV W ions and exposed to 300 eV deuterium (D) ions at different temperatures ranging from 450 K to 1000 K. After the simultaneous W ion irradiation and D ion exposure the samples were additionally exposed to low energy D ions at 450 K in order to populate all the defects created beforehand. The amount of damage created was evaluated by measuring D depth profiles and D thermal desorption spectra. Results are compared with data obtained in a sequential experiment where samples were first irradiated by 10.8 MeV W ions and only afterwards exposed to 300 eV D ions at 450 K to populate the created defects. At 450 K we observe a two times higher maximum D concentration for the simultaneous case as compared with the sequential case. At 600 K and 800 K the ratio between simultaneous and sequential decreases to about 1.6 and 1.2, respectively, and increases again to a factor of two at 1000 K. We attribute this dependence on temperature to the change in the concentration of mobile and trapped D during the simultaneous exposures, which is in line with theoretical calculations predicting that trapped D in a vacancy prevents vacancy annihilation with self-interstitials.

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Hydrogen induced vacancy formation in tungsten

Cited by 50 publications

References 93 publications

Study of hydrogen isotopes behavior in tungsten by a multi trapping macroscopic rate equation model

Study of hydrogen isotopes behavior in tungsten by a multi trapping macroscopic rate equation model

Deuterium supersaturation in low-energy plasma-loaded tungsten surfaces

Displacement damage stabilization by hydrogen presence under simultaneous W ion damage and D ion exposure

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