3.5 Polytypism and Polymorphism
55
(a)
Zn
S
2H
wurtzite
3C
zincblende
4H
6H
8H
10H
15R
B
A
C
B
A
C
A
B
A
B
C
A
C
B
A
C
B
A
B
C
A
B
A
C
B
A
C
A
B
C
A
B
A
C
A
B
C
B
A
B
C
A
C
B
C
A
B
A
(b)
Fig. 3.31 a Polytypes of the zincblende and wurtzite lattice (found in SiC), the letters A, B and C denote the three
possible positions of the diatomic layers (see Fig. 3.7). b High resolution TEM image of 6H-SiC. For the enlarged view
on the left, the unit cell and the stacking sequence are indicated. Adapted from [241]
(a)
(b)
(c)
Fig. 3.32 Polytypes of diamond found in crystallites (metastable phases in silicon). a cubic type (3C) with stacking ABC,
inset shows a diffractogram and the alignment of the C and Si lattice, b rhombohedral 9R crystallite with ABCBCACABA
stacking, c 9R phase with interface to a hexagonal 2H (AB stacking) phase. Reprinted from [242] with permission, ©2001,
Springer Nature
55
(a)
Zn
S
2H
wurtzite
3C
zincblende
4H
6H
8H
10H
15R
B
A
C
B
A
C
A
B
A
B
C
A
C
B
A
C
B
A
B
C
A
B
A
C
B
A
C
A
B
C
A
B
A
C
A
B
C
B
A
B
C
A
C
B
C
A
B
A
(b)
Fig. 3.31 a Polytypes of the zincblende and wurtzite lattice (found in SiC), the letters A, B and C denote the three
possible positions of the diatomic layers (see Fig. 3.7). b High resolution TEM image of 6H-SiC. For the enlarged view
on the left, the unit cell and the stacking sequence are indicated. Adapted from [241]
(a)
(b)
(c)
Fig. 3.32 Polytypes of diamond found in crystallites (metastable phases in silicon). a cubic type (3C) with stacking ABC,
inset shows a diffractogram and the alignment of the C and Si lattice, b rhombohedral 9R crystallite with ABCBCACABA
stacking, c 9R phase with interface to a hexagonal 2H (AB stacking) phase. Reprinted from [242] with permission, ©2001,
Springer Nature