Difference between revisions of "Integral reflection conditions"

Latest revision as of 12:59, 27 August 2018

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

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)
h − k + l = 3n	rhombohedrally centred, reverse setting	R (hexagonal axes)
h − k = 3n	hexagonally centred	H
h + k + l = 3n	D centred	D

@@ Line 3: / Line 3: @@
 == 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:
 <table border cellspacing=0 cellpadding=5 align=center>
@@ Line 45: / Line 45: @@
 <tr align=left>
 <td> ''h'' &minus; ''k'' = 3''n''</td> <td>hexagonally centred</td> <td> ''H''</td></tr>
+<tr align=left>
+<td> ''h'' + ''k'' + ''l'' = 3''n''</td> <td>D centred</td> <td> ''D''</td></tr>
 </table>