3.16: Integral reflection conditions
The integral reflections are the general reflection conditions due to the centering of cells. They are given in the table below:
|
Reflection
condition |
Centering type of cell | Centering symbol |
|---|---|---|
| None | Primitive |
P
R (rhombohedral axes) |
| h + k = 2 n | C -face centered | C |
| k + l = 2 n | A -face centered | A |
| l + h = 2 n | B -face centered | B |
| h + k + l = 2 n | body centered | I |
|
h + k , h + l and
k
+
l
= 2
n
or:
even (‘unmixed’) |
all-face centered | F |
| − h + k + l = 3 n |
rhombohedrally centered, reverse setting |
R (hexagonal axes) |
| h − k + l = 3 n |
rhombohedrally centered, obverse setting (standard) |
|
| h − k = 3 n | hexagonally centered | H |