# Integral reflection conditions

(Difference between revisions)
 Revision as of 17:21, 14 November 2017 (view source) (Added German and Spanish translations (U. Mueller))← Older edit Revision as of 13:43, 23 August 2018 (view source) (more precise formulation)Newer edit → Line 3: Line 3: == Definition == == Definition == - The integral reflections are the general [[reflection conditions]] due to the centring of cells. They are given in the table below: + 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:

## 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:

Integral reflection conditions for centred lattices.
Reflection
condition
Centring type of cell Centring symbol
None Primitive P
R (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

k + l = 2n or:
h, k, l all odd or all

even (‘unmixed’)
all-face centred F
h + k + l = 3n rhombohedrally

centred, obverse

setting (standard)
R (hexagonal axes)
hk + l = 3n rhombohedrally

centred, reverse

setting
hk = 3n hexagonally centred H