Actions

Difference between revisions of "Partial structure"

From Online Dictionary of Crystallography

 
Line 1: Line 1:
 
<font color="blue">Structure partielle</font> (''Fr'').
 
<font color="blue">Structure partielle</font> (''Fr'').
  
The crystal structure formed by a subset of elements and their symmetry equivalents contained in the unit cell.
+
The crystal structure formed by a subset of elements and their symmetry equivalents.
  
In describing a crystal structure it is sometimes convenient to characterise only the structure formed by the selected atoms.
+
In describing or analyzing a crystal structure it is sometimes convenient to consider only the structure formed by the selected atoms.
  
 
'''Example'''
 
'''Example'''

Latest revision as of 07:34, 2 June 2020

Structure partielle (Fr).

The crystal structure formed by a subset of elements and their symmetry equivalents.

In describing or analyzing a crystal structure it is sometimes convenient to consider 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