Modification of Pb(Zr,Ti)O₃ by Doping Mo based on High Power Ultrasonic Transducer

Abstract

In view of the special requirements of transducers for power ultrasonic processing, the piezoelectric ceramic material Pb(Zr,Ti)O₃ was modified by adding other effective elements. The piezoelectric ceramic piece has a good crystal phase structure, a stable piezoelectric constant, a higher dielectric constant, and a lower dielectric loss by adding a small amount of Sr²⁺, Ba²⁺, Ga²⁺, Sn⁴⁺, Nb⁵⁺, etc. These properties are well suited to requirements of power ultrasonic transducer more than 1 000 W. The crystal phase structure and surface morphology of the modified piezoelectric ceramic chips were analyzed by X-ray and scanning electron microscopy (SEM) to prove that the piezoelectric ceramic chips have good crystal structure and density. The dielectric constant of the polarized piezoelectric ceramic chips was measured using an LCR meter. Finally, the piezoelectric ceramic chips were used to design the ultrasonic transducer, and the transducer was analyzed and measured by the impedance analyzer. The measurement results show that the performance of the piezoelectric ceramic chips is reasonable and feasible.

Keywords

piezoelectric ceramic / power ultrasonic transducer / doping modification / surface morphology

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