Dislocations and coercive force in PZT materials

The model of coercive force in PZT crystals is proposed based on the consideration of local electric fields arising from accumulation of native charged point defects and/or of impurity atoms in the strain fields around the dislocations. The model accounts for the experimentally observed influences of “soft” and “hard” additives, lead and oxygen nonstoichiometry, mechanical and heat treatments on dielectric and piezoelectric properties of PZT materials.