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piezoelectric materials, which are a class of ferroelerctric materials first discovered by Pierre Curie in 1883.  By far, the ABO3 perovskite type crystal structures have dominated the field due to their relatively large electromechanical coupling:

As illustrated in the preceding sections, when a voltage is applied to these materials, they undergo a physical distortion (actuation mode), and conversely, when a mechanical stress is applied to these materials a voltage is produced (sensor mode). 

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