Researching of PZT Piezoelectric Ceramic Material Performance Technology (二)
Effect of polarized electric field on piezoelectric properties during the polarization process, the piezo ceramic sphere is the external driving force for the electric domain to turn. Under the condition of not exceeding the saturated field strength of the material, the larger piezo rings is to promote the alignment of the domains ,The greater degree of polarization, the more is complete, the piezoelectric properties are better. The piezoelectric transducer datasheet which are difficult to deflect or reorient at low pressure, pzt material piezoelectric transducer are more prone to deflection or reorientation under the high pressure, resulting in more complete polarization. For a 180 degree inversion domain, the inversion of the transducer sensor for ultrasonic dental does not result from the lateral movement of its domain wall to divert the opposite domains, but rather produces many polarizations inside the inversion domain near the electrode along the edge of the sample ,The direction and the electric field direction of the wedge-shaped piezoelectric resonator price is the new domain, the new domain nucleation after the electric field to move forward, penetrating the entire sample. As the electric field increases, new domains continue to emerge and continue to propagate throughout the reverse domain. Eventually, the reverse domain becomes consistent with the direction of the external electric field and combines with the adjacent electronic piezo ultrasonic motor to form a larger volume similar to the domain. For a 90°domain, the domain walls may move sideways, and the critical electric field is needed for the lateral movement of the 90°domain is smaller than the critical electric field required for the new wedge-shaped domain. However, for a 90°domain to be steered to the direction of the external electric field consistency will require a larger electric field, the development of its new domain is mainly driven by the external electric field 90°lateral movement of the domain wall.