This work aims to study the effects of frequency on the electrical fatigue behavior of ZnO-modified Pb(Mg1/3Nb2/3)0.65Ti0.35O3 (PMNT) ceramics. Changes of microstructures, ferroelectric and piezoelectric properties in the ceramics at bipolar electrical fatigue frequencies of 5, 10, 50 and 100 Hz were observed. The thickness of damaged surface in the ceramics decreased with increasing frequency. The degradation of properties in the ceramics fatigued at low frequency was greater than that fatigued at high frequency. The degradation by electrical fatigue at 5 and 10 Hz could be caused by the effects of both field screening and domain pinning, while at higher frequencies the fatigue was mainly a result of the field screening effect. The
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