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Figure 3
Defect atomic structure and strain distribution. (a) Magnified HAADF image and atomic model from location I in Fig. 2[link]. A single atomic column, marked by the yellow arrow, shows a large displacement with respect to the averaged position of the monolayer indicated by the dotted line. The atomic distances of dumbbells labeled in the model change gradually along the growth direction due to chemical intermixing near the interface. (b) Gaussian peak fitting of three dumbbells (A, B and C), showing the measured atomic distances. (c) and (d) Strain profiles from the anion and cation lattices, respectively, across dumbbell B compared with the average strain profile; ML stands for monolayer. The difference between the two shows characteristic positive and negative strain differences associated with the defect.

IUCrJ
Volume 5| Part 1| January 2018| Pages 67-72
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517016219