Gespeichert in:
| Hauptverfasser: | , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2411.13480 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917842562056192 |
|---|---|
| author | Hu, Zhiwei Wu, Jintong Jomard, François Granberg, Fredric Barthe, Marie-France |
| author_facet | Hu, Zhiwei Wu, Jintong Jomard, François Granberg, Fredric Barthe, Marie-France |
| contents | In this work, we propose a new approach based on positron annihilation spectroscopy to estimate the concentration of vacancy-type defects induced by self-ion irradiation in tungsten at room temperature, 500, and 700°C. Using experimental and Two-component density functional theory calculated annihilation characteristics of various vacancy clusters V$_{n}$ ($n$=1-65) and a positron trapping model associated with the simulated annealing algorithm, vacancy cluster concentration distribution could be extracted from experimental data. The method was validated against simulation results for room-temperature irradiation and transmission electron microscopy observations for higher temperatures. After irradiation at 500 and 700°C, small clusters (<20 vacancies, ~0.85 nm) undetectable by TEM were unveiled, with concentrations exceeding 10$^{25}$ m$^{-3}$, significantly higher than the concentration of TEM-visible defects (10$^{24}$ m$^{-3}$). Moreover, incorporating an oxygen-vacancy complex is deemed necessary to accurately replicate experimental data in samples subjected to high-temperature irradiation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_13480 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | New insight into quantifying vacancy distribution in self-ion irradiated tungsten: a combined experimental and computational study Hu, Zhiwei Wu, Jintong Jomard, François Granberg, Fredric Barthe, Marie-France Materials Science In this work, we propose a new approach based on positron annihilation spectroscopy to estimate the concentration of vacancy-type defects induced by self-ion irradiation in tungsten at room temperature, 500, and 700°C. Using experimental and Two-component density functional theory calculated annihilation characteristics of various vacancy clusters V$_{n}$ ($n$=1-65) and a positron trapping model associated with the simulated annealing algorithm, vacancy cluster concentration distribution could be extracted from experimental data. The method was validated against simulation results for room-temperature irradiation and transmission electron microscopy observations for higher temperatures. After irradiation at 500 and 700°C, small clusters (<20 vacancies, ~0.85 nm) undetectable by TEM were unveiled, with concentrations exceeding 10$^{25}$ m$^{-3}$, significantly higher than the concentration of TEM-visible defects (10$^{24}$ m$^{-3}$). Moreover, incorporating an oxygen-vacancy complex is deemed necessary to accurately replicate experimental data in samples subjected to high-temperature irradiation. |
| title | New insight into quantifying vacancy distribution in self-ion irradiated tungsten: a combined experimental and computational study |
| topic | Materials Science |
| url | https://arxiv.org/abs/2411.13480 |