Hexagonal close packing is one of two crystal structures that derive from stacking close-packed-planes of hard sphere atoms. In the HCP structure only two stacking ...

THE ions or molecules occupying the cells of a crystal lattice are in general optically anisotropic, and should also be capable of executing small angular oscillations about their positions of ...

Kiper and her colleagues use two layers of hexagonal boron nitride (an artificially ... diselenide and thus creates an ...

and the hexagonal Wurtzite (lower diagram). In the zinc blend structure the sulphur ions form an fcc structure and the zinc ions occupy half of the tetrahedral sites in this structure to attain charge ...