Lattice Point/Motif/Basis  Practical Electron Microscopy and Database   An Online Book  

Microanalysis  EM Book http://www.globalsino.com/EM/  


This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.  
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A lattice point is known as a motif or basis. We can obtain a crystal structure by combining the lattice with the motif (i.e., crystal structure = lattice + motif). Figure 3076a shows a periodic pattern consisting of a twodimensional (2D) net and a motif. The motif is arranged symmetrically and is repeated at each point of the 2D net to create the periodic pattern, and thus the lattice structure is also symmetric.
Figure 3076a. (a) A 2D net, (b) A motif, and (c) Formed periodic pattern (2D lattice structure).
Note that all lattice points must be identical. The unique arrangements of lattice points are socalled Bravais lattice, named after Auguste Bravais. The number of the lattice points per unit cell in 2D lattices can be given by,
Figure 3076b. Lattice points inside the unit cell and at the corners in 2D lattices. On the other hand, the number of the lattice points per unit cell in 3D lattices can be given by,
Figure 3076c. Lattice points inside the unit cell and at the corners in 3D lattices. Table 3076. Typical lattices and their basis.


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