Abstract
High power piezoelectric characteristics of perovskite-type lead-free ferroelectric ceramics, 0.88(Bi0.5Na0.5) TiO3-0.04(Bi0.5Li0.5)TiO3-0.08(Bi0.5Na0.5)TiO3 + MnCO3 0.4 wt% [BNLKT4-8Mn0.4] and KNbO3 + MnCO3 0.8 wt% [KN-Mn0.8], were focused on under large-amplitude vibration as compared with those of Pb(Zr,Ti)O3 [PZT]-based ceramics. The maximum vibration velocities, v o-p for BNLKT4-8Mn0.4 and KN-Mn0.8 reached larger than 2 m/s. A mechanical quality factor, Qm, at large-amplitude vibration for all compositions including PZT-based ceramics decreased with increasing the v o-p. The Qms of BNLKT and KN ceramics were smaller than that of hard PZT [N6] at the small-amplitude vibration. However, at the large amplitude vibration level of v o-p > 0.6 m/s, Qm values of BNLKT and KN are larger than that of N6. Therefore, lead–free piezoelectric ceramics such as BNLKT-Mn0.4 and KN-Mn08 possess superior mechanical stability at large-amplitude vibration. This is very good sign for high power piezoelectric applications.
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