Transient current of ferroelectric ceramics has been intensively studied using a stepwise electric field. Abnormal oscillations were observed in the transient current when a stepwise electric field was applied onto modified lead zirconate titanate (PZT) ceramic samples in a very short time (less than 100ns) in the present study. Compared to the frequency spectrum of those samples, it is found that those frequencies of oscillations correspond to that of piezoelectric resonance. Four samples of PZT ceramics were cut into different dimensions according to the requirement of five different electromechanical coupling modes. Experimental results demonstrate that those five piezoelectric resonance modes of the ferroelectric samples could be excited by a stepwise electric field, and different resonance modes of a sample could be excited simultaneously. The authors also found that whether piezoelectric resonance could be excited depends on the parameters of test circuit.
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Yao et al. (2006) studied this question.
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