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Engineering Physics by S. Mani Naidu

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6.7 Piezoelectricity

The word ‘Piezo’ means ‘pressure’ in Greek. So, ‘piezoelectricity’ means ‘pressure electricity’. Piezoelectric phenomenon was discovered by Curie brothers in 1880. Piezoelectric effect is shown by certain non-centrosymmetric crystals, such as quartz, rochelle salt, tourmaline and barium titanate. Electric polarization develops opposite charges on their surfaces by stress. On these substances, a mechanical stress produces an electric polarization and reciprocally, an applied electric field produces a mechanical strain. These effects are called the direct and inverse piezoelectric effects. Crystals with centres of inversion do not exhibit piezoelectricity.

A crystal can exhibit piezoelectricity only if its unit cell lacks centre ...

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