Piezoelectric ceramic

A man-made piezoelectric material in which the piezoelectric properties must be induced by poling. Piezoelectric ceramics are used in transducers. Details ...

Also, commonly called just "ceramic".

Typical piezoelectric ceramic for ultrasonic transducer
Figure 1. Typical piezoelectric ceramic for transducer

Contrast with magnetostrictive material.

See —
PZT
Manufacturer's piezoelectric cross-reference