Fig. 3.
Surface features of hexagonal prism microcrystals. a Scheme of a hexagonal prism and b–c SEM images of b a rectangular face with a (100)SL (inset) and c a hexagonal base with a (0001)SL (inset) of a hexagonal prism. For clarity, rectangular faces and a hexagonal base are color coded as blue and purple both in the scheme and SEM images, respectively. Scale bars are 500 nm. d Scheme of an AB2 unit cell and the projections of the (110)SL, (0001)SL, and (100)SL planes. The plane multiplicity can be determined by counting the number of different planes (green slabs) that correspond to the same Miller indices. Nanoparticles in different colors may occupy different layers of a plane with identical Miller indices. Gray and purple lines in the model lattice denote the edges of the unit cell and the bonds that connect complementary particles, respectively. Top–down views of different planes of the (100)SL facet are shown for clarity