Composition and basic principle of piezoelectric ceramic diaphragm

The sound source of thepiezo element buzzer is mainly from the piezoelectric diaphragm. The piezoelectric vibrating plate is composed of a piezoelectric ceramic plate on which electrodes are printed on both sides, and a metal plate (brass or stainless steel, etc.). Using a bonding agent, the piezoelectric vibrating plate and the metal piece are bonded together. This is what we call a piezoelectric buzzer.

Piezo diaphragm In an ionic crystal, the positive and negative ions are regularly arranged alternately to form a crystal lattice. This creates an intrinsic electric moment, a polarized
piezo sounder ceramic elements charge appears on the surface of the piezo crystal, and because the piezo crystal is exposed to the air over time, the charge is neutralized by the alien ions in the air that fall onto the crystal face.Therefore, both the polarization surface charge and the electric moment do not appear. However, when the crystal is mechanically deformed, the crystal lattice changes. Thus, the electric moment changes and the surface polarization charge value changes. Thus, the positive or negative charge of custom piezo bimorph on the surface has a measurable increment (increase or decrease), which is the amount of electricity produced by the piezoelectric effect.