Abstract
Electric field applicability limits were measured by the resonant methods for D.C. and pulse electric field depoled PZT ceramics. It is found that the limiting fields for soft PZT are in the range of 500–700 V/mm for D.C. depoling and in the range of 200–500 V/mm for pulses. Hard PZT ceramics is resistant to the depoling fields up to 1000 V/mm either for D.C., or pulse depoling fields. Relative changes in the magnitude of the electromechanical properties are 3–20% for the electric fields up to 1000 V/mm. Some electromechanical tensor components appear more pronounced sensitivity to the external fields than others.
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