Definition of piezoelectric effect
When some crystals are deformed by external force, polarization will occur, forming a different number of bound charges on opposite sides, called the piezoelectric effect. There are many types of piezoelectric crystals, common are quartz, potassium sodium tartrate (Rochelle salt), potassium dihydrogen phosphate (KDP), ammonium dihydrogen phosphate (ADP), barium titanate, and semiconductors such as gallium arsenide and zinc sulfide And piezoelectric ceramics. The mechanical vibration of piezoelectric crystals can be converted into electrical vibrations. It is commonly used to manufacture crystal oscillators. Its outstanding advantage is the high stability of the oscillation frequency. It can be used to stabilize the frequency of high-frequency oscillations in radio technology. This type of oscillator has been widely used Quartz clock. Piezoelectric crystals are also commonly used in electroacoustic devices such as microphones and phono cartridges. The piezoelectric phenomenon can be used to measure pressure, vibration and acceleration in various situations.