کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1680897 | 1518745 | 2012 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Molecular dynamics simulation of ion focusing and crowdion formation in self-ion-irradiated Fe Molecular dynamics simulation of ion focusing and crowdion formation in self-ion-irradiated Fe](/preview/png/1680897.png)
We have used molecular dynamics (MD) simulation to investigate damage and defect development in a 〈1 0 0〉 Fe substrate upon 2 keV Fe ion bombardment. The damage cascade formation is accompanied by atomic shifting over a limited distance along the direction of one atomic row, which leads to formation of crowdions aligned with 〈1 1 1〉 direction. At the end of structural relaxation and defect recombination, crowdions lead to formation of dumbbell defects – a type of vacancy–interstitial complexes having one vacancy between a pair of slightly displaced interstitials. The dumbbell defects are initially oriented along 〈1 1 1〉 direction. After a typical period of 0.2 ps, some dumbbell defects rotate towards 〈1 1 0〉 direction. Crowdion and dumbbell defect formation influence the time dependent damage buildups.
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 272, 1 February 2012, Pages 33–36