The characteristic property of any crystal is the ordered and symmetrical arrangement of the atoms in it; that is, the presence of the spatial structure called the crystal lattice. The crystal lattice is usually represented by a spatial grid of the straight lines (Fig. 1.1). The intersection points are called the lattice nodes. Only in the simplest case does a single node correspond to a single atom. If there are several kinds of atoms in the crystal structure, then a group of atoms is related to every node; these groups form the basis and are identical in constitution, position, and orientation.
KeywordsAttenuation Hexagonal Tungsten Germanium Verse
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