High-Power Piezoelectric Characteristics of Textured Bismuth Layer Structured Ferroelectric Ceramics

The high-power piezoelectric characteristics in c-axis oriented ceramics of bismuth layer structured ferroelectrics (BLSF), SrBi₂Nb₂O₉ (SBN), Bi₄Ti₃O₁₂ (BIT) and CaBi₄Ti₄O₁₅ (CBT), were studied by constant voltage driving method. These textured ceramics were fabricated by templated grain growth (TGG) method, and their Lotgering factors were 95%, 97%, and 99%, respectively. The vibration velocities increased proportionally to an applied electric field up to 2.5 m/s in these textured BLSF ceramics, although, the vibration velocity was saturated at more than 1.0 m/s in the Pb(Mn,Nb)O₃-PZT ceramics. The resonant frequencies were constant up to the vibration velocity of 2.5 m/s in the SBN and CBT textured ceramics, however, the resonant frequency decreased with increasing the vibration velocity of more than 1.5 m/s in the BIT textured ceramics.