, one being occupied by the Zn atoms and the other by the S atoms. The sublattices are shifted by 1/4
with respect to one another (see Figure Z.1). Another way of describing the structure is the following: the S atoms form an FCC sublattice in which the Zn atoms form the other sublattice, whose sites occupy one half of the
in the first one. A
for both of the atom types in the structure is a tetrahedron, which implies that the
bond directionality may have the same structure. This is the case, e.g., in III-V semiconductor compounds.