Things Your Boss Wishes You Knew About Piezoelectric Transducer

             Things Your Boss Wishes You Knew About Piezoelectric Transducer

A new type of perovskite system with high curie point is synthesized by solid phase method. Among them, Me3 + piezoelectric ceramic transducer ultrasound is a relatively large radius cation such as Sc, Y, Yb, In and so on. The solid solution system can obtain a stable rhombohedral ferroelectric phase, and a transition to a ferroelectric tetragonal phase occurs, that is, a quasi-homogeneous piezo ball for underwater device is reached. Near the quasi-homogeneous phase boundary, the piezoelectric coefficient d33 can reach 450 pc and the Curie temperature high performance piezo ceramic is 450 ℃, which is much higher than the commercial PZT. At the same time, the dielectric constant of 1.7 MHz piezoelectric ring can reach 2 000, the electromechanical coupling coefficient reaches 0.56, the remanent polarization Pr = 32 μC / cm2 and the coercive field Ec = 20 kV / cm. The performance comparison of BSPT system pickup piezo transducerand various system piezoelectric ceramics is given. The performance of BSPT ceramics is comparable to that PZT, with a high Curie temperature. Microstructure has observation of BSPT system,When the system is in rhombic phase, twins of 71 ° domain and 109 ° domain can be observed; in the tetragonal phase, 90°domain and 180°domain are observed. At the same time, the electron diffraction spectrum of piezo level sensor shows that when the system is rhombohedral, superlattices will appear at 1/2 (hkl), which is due to the reverse rotation of the oxygen octahedron, indicating that this rhombohedral belongs to the R3m space group ; While in the quasi- homophase facies but did not observe the octahedron reverse rotation, this time the rhombus phase belongs to R3c space group. With the increase of PbTiO3 content and the increase of temperature, R3c will be promoted to R3m.