Piezo-electric effect

• Piezo-electric effect:-

When some pressure or stress is applied to the surface of the piezo-electric

crystal, the dimensions of the crystal change and an electric charge voltage will be developed

across certain surfaces of the piezo-electric crystal. Conversely, when an electric charge voltage or potential is applied to the crystal, the crystal get deformed and hence, the dimensions of it will change. This effect is referred as piezoelectric

All the piezo-electric transducers work on the principle of piezo-electric effect.  

          

The piezoelectric materials or the materials used in the construction of piezoelectric crystal are quartz, rochelle salt, dipotassium titrate, lithium sulphate, barium titanate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate etc. 

A piezoelectric crystal subjected to force is that shown in figure 6.1.