4.8. 1 Piezoelectric effect In Fig. 4.55 subscript i corresponds to x-axis subscript 2 to y-axis subscript 3 to z-axis uIt is evident that the piezoelectric constants are different when the directions of force application and the generated deformations are different❑ In Fig. 4.55 • subscript 1 corresponds to x-axis • subscript 2 to y-axis • subscript 3 to z-axis. ❑It is evident that the piezoelectric constants are different when the directions of force application and the generated deformations are different. 4.8.1 Piezoelectric effect