# Difference between revisions of "Partial structure"

### From Online Dictionary of Crystallography

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<font color="blue">Structure partielle</font> (''Fr''). | <font color="blue">Structure partielle</font> (''Fr''). | ||

− | The crystal structure formed by a | + | The crystal structure formed by a subset of elements and their symmetry equivalents contained in the unit cell. |

In describing a crystal structure it is sometimes convenient to characterise only the structure formed by the selected atoms. | In describing a crystal structure it is sometimes convenient to characterise only the structure formed by the selected atoms. |

## Revision as of 18:02, 30 May 2020

Structure partielle (*Fr*).

The crystal structure formed by a subset of elements and their symmetry equivalents contained in the unit cell.

In describing a crystal structure it is sometimes convenient to characterise only the structure formed by the selected atoms.

**Example**

The structure of [math]BaTiO_3[/math] is tetragonal with a primitive unit cell and lattice constants [math]a[/math] and [math]c[/math]. The partial structure of Ba has the same lattice constants whereas the partial structure of O has also a primitive cell but with the lattice constant [math]a_O = a/ \sqrt{2}[/math], [math]c[/math] being equal

See synonymous Substructure