EDITOR'S MESSAGE

摘要

Many properties of the materials are related to their crystalline arrangement, which is the ordered pattern followed by the atoms, ions or molecules in the space: metals and ceramics crystallize mostly in cubic or hexagonal geometry, while that of polymers and organic molecules use to be more complex. The unitary cell is defined as the structure with the minimum number of atoms, ions or molecules, that retains the symmetry of the crystal, while its periodic repetition of it generates the lattice.