Study of compressive type accelerometer based on lead-free BNKBT piezoceramics

摘要

Lead-free piezoelectric 0.90(Bi1/2Na1/2)TiO 3-0.05(Bi1/2K1/2)TiO3-0.05BaTiO 3 ceramics(abbreviated as BNKBT-5) rings were fabricated using a conventional mixed oxide method. The ceramics have a piezoelectric constant d33=168 pC/N, electromechanical coupling factors kp=0.313 and kt=0.487. The BNKBT lead-free ceramic rings were used as the transduction elements in a compressive type accelerometer and its performance compared with a lead zirconate titanate (PZT) APC 840 ceramic accelerometer with similar structure. The lead-free accelerometer shows good performance and has a broader frequency response compared to the lead-based PZT accelerometer.