20.500.12556/DiRROS-24683 Deuterium retention and transport in ion-irradiated tungsten exposed to deuterium atoms role of grain boundaries Deuterium retention and transport in ion-irradiated tungsten exposed to deuterium atoms: role of grain boundaries The influence of grain boundaries on deuterium (D) retention and transport was investigated in nanocrystalline tungsten (W) by exposing the samples to sub eV D atoms. Thin tungsten films with nanometer-sized grains were produced by pulsed laser deposition on tungsten substrates. Their grain size was increased up to one micrometer by thermal annealing in vacuum up to 1223 K. Irradiation damage was created by 20 MeV W ions at 290 K. The transmission electron microscopy analysis showed one order of magnitude larger dislocation density in nanometer-grained samples compared with the larger-grained samples. The samples were after W irradiation exposed to 0.3 eV D atoms at 600 K. D retention and D depth profiles were measured by nuclear reaction analysis. In the as-deposited nanometer-grained samples, D populated the damaged region more than three times faster than in the samples with larger grains, indicating that grain-boundaries increase D transport through the material. The concentration of defects was assessed by the final D concentration in the samples. The sample with a smallest grain size showed slightly larger D concentration in the irradiated area, but the difference in the D concentration is not substantial between different-grained samples. A large D concentration in the non-irradiated nanometer-grained sample was measured which is an indication for a high defect density in the initial material. From our observations, it can be postulated that the nanocrystalline microstructure did not substantially influence the generation of irradiation-induced defects by defect annihilation at grain boundaries. deuterium tungsten grain boundaries transport displacement damage retention true false true Elsevier Nizozemska Angleški jezik Ni določen © 2024 The Authors. Neznano 2025-12-12 09:28:31 2025-12-12 09:28:31 2025-12-13 03:51:06 0000-00-00 00:00:00 2024 0 0 Nasl. z nasl. zaslona; Soavtorji iz Slovenije: J. Zavašnik, A. Šestan, M. Kelemen, E. Punzón-Quijorna; Opis vira z dne 11. 1. 2024; str. 1-25 Vol. , [article no.] 101589 Vol. 38 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-11-15 2024-01-08 2024-01-09 53 2352-1791 10.1016/j.nme.2024.101589 180564483 https://www.sciencedirect.com/science/article/pii/S2352179124000115?via%3Dihub 1 8d3b7991-d734-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=36853 RAZ_Markelj_Sabina_2024.pdf RAZ_Markelj_Sabina_2024.pdf 1 654956E2B41367F22BF0628520BC015B 8a915a954f7f9aa46f5e5770af631c26daee4aedde4336b00becf2bfd2e9418d 1f240b42-d735-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=36856 Institut Jožef Stefan 0 0 0