Views: 3 Author: Site Editor Publish Time: 2018-11-19 Origin: Site
Barium titanate piezoelectric ceramics (3BaTiO. Barium titanate is the first piezoelectric ceramic made and widely used, and its electromechanical coupling coefficient is very high. Compared with other piezoelectric ceramics, it has a lower curie point and its electromechanical.The performance is very unstable in the normal temperature range and has a large aging rate. Under the action of strong electric field, the dielectric loss is also relatively large. In order to improve the performance of barium titanate, ion replacement and addition of a small amount of additives are used to improve temperature stability of piezoelectric constant, elastic constant and dielectric constant of piezoelectric ceramics discs.
Lead zirconate titanate electronic transducer piezo ceramics (PZT): The zirconium titanate piezoelectric piezoelectric ceramic has a higher curie point than barium titanate, and its performance is relatively stable in a large temperature range. As a transducing material, Its piezoelectric effect is remarkable. And its chemical properties can be greatly adjusted by changing its chemical composition. There are many kinds of lead zirconate titanate, each with its own characteristics. PZT-4 (emissive type) has low mechanical loss and dielectric loss, large AC depolarization field, and has large dielectric constant, electromechanical coupling coefficient and piezoelectric constant, especially is suitable for strong electric field and large mechanical amplitude. PZT-5 material (receiving type) has high electromechanical coupling coefficient, high voltage electrical strain constant and high resistivity. Each electromechanical parameter has excellent time stability and temperature stability, and is suitable for low power resonance and non-resonance. PZT-8 Pzt ceramic ring transducer has lower mechanical loss and dielectric constant and electromechanical coupling coefficient than PZT-4, but its tensile strength and stability are better than PZT-4, which is more suitable for high mechanical amplitude excitation and bismuth bismuth hydride piezoelectric ceramics.
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