Open AccessShear displacement gradient in X‐ray Bragg coherent diffractive imaging
Author(s) -
Gorobtsov Oleg,
Singer Andrej
Publication year - 2022
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577522002363
Subject(s) - perpendicular , optics , reciprocal lattice , materials science , displacement field , displacement (psychology) , displacement mapping , dislocation , diffraction , physics , geometry , condensed matter physics , computer science , mathematics , psychology , texture mapping , finite element method , artificial intelligence , psychotherapist , thermodynamics
Bragg coherent X‐ray diffractive imaging is a cutting‐edge method for recovering three‐dimensional crystal structure with nanoscale resolution. Phase retrieval provides an atomic displacement parallel to the Bragg peak reciprocal lattice vector. The derivative of the displacement along the same vector provides the normal strain field, which typically serves as a proxy for any structural changes. In this communication it is found that the other component of the displacement gradient, perpendicular to the reciprocal lattice vector, provides additional information from the experimental data collected from nanocrystals with mobile dislocations. Demonstration on published experimental data show how the perpendicular component of the displacement gradient adds to existing analysis, enabling an estimate for the external stresses, pinpointing the location of surface dislocations, and predicting the dislocation motion in in situ experiments.