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Revealing nano-scale lattice distortions in implanted material with 3D Bragg ptychography

Abstract : Small ion-irradiation-induced defects can dramatically alter material properties and speed up degradation. Unfortunately, most of the defects irradiation creates are below the visibility limit of state-of-the-art microscopy. As such, our understanding of their impact is largely based on simulations with major unknowns. Here we present an x-ray crystalline microscopy approach, able to image with high sensitivity, nano-scale 3D resolution and extended field of view, the lattice strains and tilts in crystalline materials. Using this enhanced Bragg ptychography tool, we study the damage helium-ion-irradiation produces in tungsten, revealing a series of crystalline details in the 3D sample. Our results lead to the conclusions that few-atom-large ‘invisible’ defects are likely isotropic in orientation and homogeneously distributed. A partially defect-denuded region is observed close to a grain boundary. These findings open up exciting perspectives for the modelling of irradiation damage and the detailed analysis of crystalline properties in complex materials.
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Submitted on : Monday, January 31, 2022 - 3:54:14 PM
Last modification on : Thursday, June 9, 2022 - 8:20:09 AM
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Peng Li, Nicholas Phillips, Steven Leake, Marc Allain, Felix Hofmann, et al.. Revealing nano-scale lattice distortions in implanted material with 3D Bragg ptychography. Nature Communications, Nature Publishing Group, 2021, 12 (1), pp.7059. ⟨10.1038/s41467-021-27224-5⟩. ⟨hal-03465546⟩



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