Piezoelectricity means electricity generated by pressure. Piezoelectricity is a form of electricity created when certain crystals are bent or deformed. Piezoelectricity is the basic principle of biomechanical energy harvesting that use Piezoelectric pressure sensors or transducers. Piezoelectricity is the direct result of the piezoelectric effect, which is an electrical charge generated from an applied mechanical force.

Piezoelectric Materials that Exhibit Piezoelectricity

The piezoelectric effect occurs only in non conductive materials. Piezoelectric materials can be divided in 2 main groups: crystals and cermaics.

piezoelectric crystalline materials are Quartz, Rochelle salt, Cane sugar, Topaz, Tourmaline, Berlinite (AlPO4), Gallium orthophosphate (GaPO4), Langasite, etc.

piezoelectric ceramics are Barium titanate, Lead titanate, Lead zirconate titanate, Potassium niobate, Lithium niobate, Lithium tantalate, Sodium tungstate, Bismuth ferrite, Sodium niobate, etc.

Piezoelectric Energy Harvesting Applications

Piezoelectric Energy Harvesting Circuits are used in self-powered batteryless (or battery-free) small portable electronics devices. Piezoelectric sensors hardly generate millivolts power, so piezoelectric Energy Harvesting cane used for ultra small wireless electronics devices such as spy cameras, patient monitoring wirelessly (with body sensors), wireless home security intruder alarm systems that sounds when somebody walks over the piezoeletric sensored carper, etc.