In the year 1880 the brothers Jacques and Pierre Curie  discovered the phenomenon of piezoelectricity. They found that when a weight is placed on the surface of an X-cut quartz plate electric charges are developed on either surface of the quartz plate. They measured the charge thus developed and found it to be linearly proportional to the weight placed. The electromechanical interaction in crystals is called piezoelectricity. Their experiment demonstrates the direct piezoelectric effect. Several crystals including quartz, tourmaline, and Rochelle salt were found to exhibit the piezoelectric property.
KeywordsPoint Group Piezoelectric Effect Symmetry Element Piezoelectric Constant Piezoelectric Crystal
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