Lead zirconium titanate (PZT, also Lead zirconate titanate) is a ceramic material that shows a marked piezoelectric effect - that is, it develops a voltage difference across two of its faces when compressed, and ferroelectric effect. It also features an extremely large dielectric constant. These properties make it one of the most prominent and useful electroceramics. It is used to make ultrasound transducers and other sensors and actuators, as well as high-value ceramic capacitors and FRAM chips.
Source: Wikipedia
