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Lead zirconate titanate (PZT) is a ceramic material that shows a marked piezoelectric effect - that is, it develops a voltage difference across two of its faces when compressed. It also features an extremely large dielectric constant. It is used to make ultrasound transducers and other sensors and actuators, as well as high-value ceramic capacitors.
Pb(Zr52Ti48)O3
PZT Material properties (http://www.efunda.com/materials/piezo/material_data/matdata_output.cfm?Material_ID=PZT-5A)
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