# Crystal systems and bravais lattices pdf

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- Symmetry, Crystal Systems and Bravais Lattices
- bravais lattice pdf

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There are fourteen distinct space groups that a Bravais lattice can have. Thus, from the point of view of symmetry, there are fourteen different kinds of Bravais lattices. Auguste Bravais was the first to count the categories correctly. I list below the seven crystal systems and the Bravais lattices belonging to each. Cubic 3 lattices The cubic system contains those Bravias lattices whose point group is just the symmetry group of a cube. Three Bravais lattices with nonequivalent space groups all have the cubic point group. They are the simple cube , body-centered cubic , and face-centered cubic.

In any sort of discussion of crystalline materials, it is useful to begin with a discussion of crystallography: the study of the formation, structure, and properties of crystals. A crystal structure is defined as the particular repeating arrangement of atoms molecules or ions throughout a crystal. Structure refers to the internal arrangement of particles and not the external appearance of the crystal. However, these are not entirely independent since the external appearance of a crystal is often related to the internal arrangement. For example, crystals of cubic rock salt NaCl are physically cubic in appearance.

## Symmetry, Crystal Systems and Bravais Lattices

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## bravais lattice pdf

In crystallography , the hexagonal crystal family is one of the six crystal families , which includes two crystal systems hexagonal and trigonal and two lattice systems hexagonal and rhombohedral. The hexagonal crystal family consists of the 12 point groups such that at least one of their space groups has the hexagonal lattice as underlying lattice, and is the union of the hexagonal crystal system and the trigonal crystal system. The hexagonal unit cell for the rhombohedral Bravais lattice is the R-centered cell, consisting of two additional lattice points which occupy one body diagonal of the unit cell.

*During this course we will focus on discussing crystals with a discrete translational symmetry, i.*