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(a) Stress in a wurtzite core-shell nanowire: the lattice misfit between the ZnO core and the ZnMgO shell lead to a vertical stress and a planar stress (black arrows). At the corners between two m facets of the nanowire, there is a component of the planar stress directed towards the core (red arrows). (b) and (c): Glide systems with possible glide directions indicated by red arrows. (b) The activated prismatic glide planes are represented by dashed lines, and the basal plane is activated only at the corner. (c) Some activated pyramidal glide planes are colored in blue.
Weak-beam TEM images of a core-shell nanowire taken along the zone axis (ZA), with (a) , and (b) g = (0002). (c) Two-beam TEM image taken along the zone axis with . The red arrows indicate dislocation loops in prismatic planes, the blue ones indicate dislocation loops in pyramidal planes, and the green ones indicate moirés inside dislocation loops on the image, with zooms on these moirés.
(a) Two-beam TEM image with of a closed dislocation loop within a ZnMgO barrier, (b) schematics of a half-dislocation loop formation in ZnMgO, and (c) schematics of the closed dislocation loop between the ZnO core and the ZnO quantum well.
Plane view TEM image in the  zone axis with an aperture to select only the direct beam. A closed dislocation loop with a moiré is visible between two ZnO quantum wells (circled in red), and a dislocation is visible in the ZnO core.
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