Researching performance of PZT Piezoelectric Ceramic Material

Experiments are used for the production and research, often use some oxides and compounds as trace additives to improve the performance of piezoelectric ceramics. These trace additions replace the positions of some titanium ions and zirconium ions respectively in PZT, electrical hifu ultrasound makes the domain walls in the grains easy to move, piezoceramic ultrasonic resonator is resulting in a marked decrease of the coercive electric field and the reduction of the three polarization conditions.which is easily polarized. After long-term repeated experiments to determine 6. 5 MHz P5 materials piezoelectric ceramic filter to the modified PZT material, which is composed of Pb0. 90Sr0. 05Mg0 03 Ba0 02 (Zr0. 53Ti0 47) O3 +, CeO2 + MnO2 piezoelectric ceramic material after pre-burning, molding, firing, grinding process, made of 24 mm×0. 35 mm of the round ceramic wafer on both sides of the silver, placed in an oven at 100 ℃ Bake 10 min or more, to the silver layer blue hair removed tiles.Then, will be good silver porcelain placed in a box furnace to 15 ℃ / 6 min heating rate uniform heating to 100 ℃, constant temperature 0.5 h, continue to 15 ℃ / 6 min heating rate uniform heating to 400 ℃, and then 20 ℃ / 6 min heating rate uniform heating to 700 ℃, constant temperature 20 min, slowly cooled to below 100 ℃ baked. Placed good silver porcelain placed at room temperature for 12 h, into the silicone tank, polarized under different polarization conditions, measured after 24 h to measure the piezoelectric properties. Effect of polarized electric field on piezoelectric properties during the polarization process, the polarized electric field 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 is to promote the alignment of the domains .The greater the degree of polarization, the more piezo bimorph actuator is complete, the piezoelectric properties are better. The domains which are difficult to deflect or reorient at low pressure, are more prone to deflection or reorientation under high pressure, resulting in more complete polarization. For a 180 degree inversion domain, the inversion of the domain does not result from the lateral movement of its domain wall to divert the opposite domains, but instead piezoelectric sensor crystal 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 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 domains to form a larger volume similar to the domain.