Piezoelectricity exists in non-centrosymmetric crystalline materials. In a piezoelectric lattice, mechanical stress alters the distance between the center of positive charges and the center of negative charges, which creates electric dipole moments or changes the existing ones. In either way, polarization charges are induced on the surface of the material. Alternatively, an electric field can cause mechanical strain in the crystal
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Gulz - (no access) - Piezotronic Effect An Emerging Mechanism for sensing applications.pdf, p2
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