Acoustic emission and piezoactivity during poling in PZT-like ferroelectric ceramics

Acoustic Emission (AE) induced by poling field was observed in the PZT-like ferroelectric ceramics at the room temperature. Relationships between AE characteristics and electromechanical coupling coefficients as the measure of poling show that domains in grains have the various levels of charactersitic threshold field to reverse their polarization directions or to move domain walls. Reversals of domain states with higher threshold field levels occur large amplitude acoustic emissions.