Catalyst | Representative catalyst | Characteristic |
ABO3-type | BaTiO3 | The BaTiO3 of the cubic phase entails central symmetry but lacks piezoelectricity because the Ti4+ ion is located at the center of TiO6 |
Pb(Zr1−xTix)O3 | ||
KNbO3 | ||
Wurtzite | ZnO | In the ZnO crystal structure, Zn2+ and O2− are stacked layer by layer along the c-axis, and their centers overlap with each other, hence the nondetection of polarization in normal crystals. |
piezoelectric polymers | PVDF | certain flexible polymers exhibit piezoelectricity because of their asymmetrical molecular structure and orientation |
PVDF-(TrFE) |