Discovery and application of piezoelectric effect-www.ultra-piezo.com

Jacques and Pierre Curie discovered the piezoelectric effect in 1880. They found that if some crystals were mechanically strained, they became polarized, and the degree of polarization j was proportional to the applied value. Juris also found that these same The material deforms when exposed to an electric field, which has been called the inverse piezoelectric effect.

Many naturally occurring crystals (such as quartz, tourmaline, and sodium potassium tartrate) exhibit piezoelectric effects, and these have been used as electromechanical transducers for many years. In order to exhibit a piezoelectric effect, the structure should have no center of symmetry, and the stress (stretching or compressing) applied to the crystal will change the separation between the positive and negative charge positions in the single crystal cell, resulting in crystals. Net polarization at the surface.

In practice this effect is actually linear, ie the polarization of the piezoelectric ceramic sheet varies directly with the applied stress and, depending on the direction, such that the compressive and tensile stresses will generate an electric field and thus produce a voltage of opposite polarity. It is also mutual, so if the piezoelectric ceramic crystal is exposed to an electric field, it will undergo elastic strain, causing its length to increase or decrease depending on the field polarity.

Piezoceramic PZT Material

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