Vibration velocities under high-power driving on perovskite-type lead-free ferroelectric ceramics

High power piezoelectric characteristics of perovskite-type lead-free ferroelectric ceramics, 0.88(Bi 0.5 Na 0.5 )TiO 3 -0.04(Bi 0.5 Li 0.5 )TiO 3 -0.08(Bi 0.5 Na 0.5 )TiO 3 +MnCO 3 0.4 wt% [BNLKT4-8Mn0.4] and KNbO 3 +MnCO 3 0.8 wt% [KN-Mn0.8], were focused on under large-amplitude vibration as compared with those of Pb(Zr,Ti)O 3 [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, Q m , at large-amplitude vibration for all compositions including PZT-based ceramics decreased with increasing the v o-p . At the large amplitude vibration level of v o-p >;0.6 m/s, Q m values of BNLKT and KN are larger than that of N6. Additionally, heat generation under a continuous driving on lead-free and hard PZT [N-6] ceramics show similar tendency as a function of vibration velocity.