Fig. 2: SEM images and analysis of Wulff-shaped microcrystals.

a Left: large-scaled SEM image of cubic microcrystals. Right: size distribution of 100 microcrystals (n = 100), average edge length: 3.51 ± 0.98 μm (mean ± SD). Scale bar: 20 μm. b Large-scale SEM image of cuboid microcrystals. Middle: size distribution of 50 microcrystals (n = 50) in terms of a (blue) and c (purple), average edge length of a: 2.69 ± 0.59 μm (mean ± SD), average edge length of c: 4.69 ± 1.04 μm (mean ± SD). Right: distribution of the ratio between a (or b) and c of microcrystals. Scale bar: 10 μm. c SEM image of an individual cubic microcrystal. Top right panel: close-up view of a partial region with a vacancy inside (enclosed by the red square) and corresponding model. Surficial steps are labelled with blue and indicated in the schematic. Scale bar: 1 μm. d SEM image of an individual cuboid microcrystal. Top left panel: close-up view of a partial region with a vacancy inside (enclosed by the red square) and corresponding model. A surficial adatom is labelled with green and indicated in the schematic as well. Scale bar: 1 μm. Source data are provided as a Source Data file.