# Integral reflection conditions

### From Online Dictionary of Crystallography

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== Definition == | == Definition == | ||

- | The integral reflections are the general [[reflection conditions]] | + | The integral reflections are the general [[reflection conditions]] appearing when a [[centred lattices|multiple (non-primitive) cell]] is used to describe the [[Bravais lattice]] of a crystal. They are given in the table below: |

<table border cellspacing=0 cellpadding=5 align=center> | <table border cellspacing=0 cellpadding=5 align=center> |

## Revision as of 13:43, 23 August 2018

Conditions de réflexion intégrales (*Fr*). Integrale Auslöschungen (*Ge*). Ausencias integrales (*Sp*).

## Definition

The integral reflections are the general reflection conditions appearing when a multiple (non-primitive) cell is used to describe the Bravais lattice of a crystal. They are given in the table below:

Reflection condition |
Centring type of cell | Centring symbol |
---|---|---|

None | Primitive | PR (rhombohedral axes) |

h + k = 2n | C-face centred | C |

k + l = 2n | A-face centred | A |

l + h = 2n | B-face centred | B |

h + k + l = 2n | body centred | I |

h + k, h + l and
| all-face centred | F |

− h + k + l = 3n | rhombohedrally centred, obverse |
R (hexagonal axes) |

h − k + l = 3n | rhombohedrally centred, reverse | |

h − k = 3n | hexagonally centred | H |

## See also

- Chapter 2.1.3.13 of
*International Tables for Crystallography, Volume A*, 6th edition