PZT piezo ceramics material

The scientists find that when the PZT material has a quasi-homogeneous phase boundary (hereinafter referred to as MPB) at the Zr / Ti ratio, the tetragonal phase and the tripartite phase of piezoelectric ring transducercoexist at this phase boundary, and the PZT material has better ferroelectricity and electrical properties. The ferroelectric material piezoelectric disc crystal near M BP has a large remanent polarization Pr, and the curie temperature of pzt material piezo ceramic can be adjusted in a wide range. It is easy to prepare a ferroelectric material with a perovskite structure. The material cost is relatively low, good.At present, a large number of studies have been obtained and which is applied for piezoelectric ceramics.it is mainly perovskite type, tungsten bronze type and bismuth layered structure, the performance of these types ring piezoelectric actuators piezoelectric materials comparison.It is known PZT material system. Although the piezoelectric performance is good, the curie temperature Tc is only 386 ℃, which limits PZT piezo ceramics in the high temperature field. The Curie temperature of lead titanate (PT) piezoelectric ceramics is 490 ℃, the dielectric constant of ring piezoelectric transducer is small, High electrical properties, large piezoelectric anisotropy, the third harmonic temperature coefficient is the smallest of existing ceramic materials.But lead titanate ceramic sintering difficulties exist in the cooling process of cubic to tetragonal phase transition, Easy to crack, big Axial ratio makes the coercive field large and difficult to polarization.Adding the right amount of modified additives can overcome process difficult to get excellent performance piezoelectric ceramic material.With the Curie temperature of bismuth layered piezo ceramic ring plate  exceeds 600°C, but the piezoelectric constant d 33 is small.