Polar Point Groups for Ferroelectricity
- Practical Electron Microscopy and Database -
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Table 2378 list the ten polar point groups that can possess ferroelectricity.

Table 2378. The ten polar point groups that can possess ferroelectricity.

Polar point groups
(Schönflies)

Crystal system

Possible ferroelectric polarizations (Crystal coordinates )

Possible domain walls
1 (C1)
Triclinic P1, P2, P3 48 types
2(C2)
Monoclinic 0, P2, 0 24 types
4mm(C4v)
Trigonal
0, 0, 0, P3 1 type: 180° ⊥ to (001)

3(C3)

0, 0, P3
4(C4)
Tetragonal 0, 0, P3 2 types: 90° [110], 180° [001]
3m(C3v)
Hexagonal 0, 0, P3  
6(C6)
 
m (CS)
  P1, 0, P3  
mm2 (C2v)
Orthorhombic 0, 0, P3 4 types: 60°, 120°:[100], 90°, 180°:[110]
6mm(C6v)
  0, 0, P3  

 

 

 

 

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