Piezoelectric device, piezoelectric actuator having the same, liquid discharge apparatus, and power generating apparatus

摘要

Providing a piezoelectric device excellent in both transmission and reception capabilities and appropriate for use as a piezoelectric actuator, a sensor, an ultrasonic sensor, or a power generating device. A piezoelectric device (1) which includes a piezoelectric body (13) having piezoelectricity and a pair of electrodes (12, 14) for applying an electric field to the piezoelectric body in a predetermined direction in which a piezoelectric strain constant d 33 (pm/V) and a relative permittivity µ 33 of the piezoelectric body satisfy Formulae (1) and (2) below. 100 < µ 33 < 1500 d 33 pm / V > 12 �¢ ˆšµ 33