LiZn_4 − x (x = 0.825) as a (3 + 1)-dimensional modulated derivative of hexagonal close packing

The derivative from the hexagonal close packing LiZn_4 − x (x = 0.825) binary compound crystallizes in the orthorhombic superspace group Cmcm(α00)0s0.

Cu₃Sn – understanding the systematic absences

The structure of Cu₃Sn is best understood as a compositional modulation of a simple hexagonal close packing. It is one member of a large family of such structures.