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An example is that crystalline silicon carbide (SiC) has structures of tetrahedrally coordinated lattice. The atomic layers can stack in cubic (C), hexagonal (H),or rhombohedral (R) configurations. These structures are labeled by the symmetry (C, H, or R) following the number of the layers in one period of the stacking sequence. Therefore, 3C is equivalent to the zincblende structure, while 2H is the wurtzite structure. The most common commercially available form is 6HSiC.
The zincblende structure is in a symmetry group with three twofold axes, eight threefold axes, four fourfold axes, and six symmetry planes, but it does not have an inversion symmetry.
Table 2081. Properties of some zincblende structures.
Crystal 
Lattice constant (a, nm) 
AlAs 
0.566 
AgI 
0.647 
AlP 
0.545 
AlSb 
0.613 
BeS 
0.485 
BeSe 
0.507 
BeTe 
0.554 
CdS 
0.582 
CdTe 
0.648 
CuBr 
0.569 
CuCl 
0.541 
CuI 
0.604 
GaAs 
0.565 
GaSb 
0.612 
GaP 
0.545 
HgS 
0.585 
HgSe 
0.608 
HgTe 
0.643 
InAs 
0.604 
InP 
0.587 
InSb 
0.646 
SiC 
0.435 
ZnS 
0.541 
ZnSe 
0.565 
ZnTe

0.609 
