Bipolar and Unipolar Fatigue of Ferroelectric BNT-Based Lead-Free Piezoceramics

摘要

The bipolar and unipolar fatigue behavior of the lead-free piezo-and ferroelectric 0.94Bi_(1/2)Na_(1/2)TiO_3-0.06BaTiO_3 (94BNT-6BT) was investigated. To obtain a complete profile of the fatigue behavior, both large-signal (polarization, strain) and small-signal (d_(33)/ε_(33)) properties were measured at room temperature. The results indicate that the material suffers a significant degradation in both large- and small-signal properties after cycling, with most of the fatigue occurring in the first 10~4 cycles of the fatigue test.