## Crystal structure |

in

,crystallography **crystal structure**is a description of the ordered arrangement of ,atoms orions in amolecules .crystalline material ^{[3]}ordered structures occur from the intrinsic nature of the constituent particles to form symmetric patterns that repeat along the principal directions of in matter.three-dimensional space the smallest group of particles in the material that constitutes this repeating pattern is the

**unit cell**of the structure. the unit cell completely reflects the symmetry and structure of the entire crystal, which is built up by repetitive of the unit cell along its principal axes. the translation vectors define the nodes of thetranslation .bravais lattice the lengths of the principal axes, or edges, of the unit cell and the angles between them are the

, also calledlattice constants *lattice parameters*or*cell parameters*. the properties of the crystal are described by the concept ofsymmetry .space groups ^{[3]}all possible symmetric arrangements of particles in three-dimensional space may be described by the 230 .space groups the crystal structure and symmetry play a critical role in determining many physical properties, such as

,cleavage , andelectronic band structure .optical transparency - unit cell
- classification by symmetry
- atomic coordination
- grain boundaries
- defects and impurities
- prediction of structure
- polymorphism
- physical properties
- see also
- references
- external links

In **crystal structure** is a description of the ordered arrangement of ^{[3]} Ordered structures occur from the intrinsic nature of the constituent particles to form symmetric patterns that repeat along the principal directions of

The smallest group of particles in the material that constitutes this repeating pattern is the **unit cell** of the structure. The unit cell completely reflects the symmetry and structure of the entire crystal, which is built up by repetitive

The lengths of the principal axes, or edges, of the unit cell and the angles between them are the *lattice parameters* or *cell parameters*. The ^{[3]} All possible symmetric arrangements of particles in three-dimensional space may be described by the 230

The crystal structure and symmetry play a critical role in determining many physical properties, such as