Crystals
Quartz SiO2
Berlinite AlPO4
Gallium orthophosphate GaPO4
Tourmaline
Ceramics
Barium titanate BaTiO3
Lead zirconate titanate PZT

Other materials
Zinc oxide ZnO
Aluminum nitride AlN
Polyvinylidene fluoride PVDF
More piezo materials

Applications
Sensors
Ultrasonic transducers
Piezoelectric motors
Other applications

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References
Suppliers