Piezoelectric Properties of Lead-free Piezoelectric Ceramics and Their Energy Harvester Characteristics

摘要

The energy convergence efficiency (η) and dimensionless figure of merit (DFOM) of CuO-added (Na_(0.5)K_(0.5))NbO_3 (CNKN) ceramics are larger than those of NKN ceramics because of their large Q_m values and small dielectric losses. Moreover, the η and DFOM values of CNKN ceramics are comparable to those of P-5C ceramics, which exhibit the highest η and DFOM. Furthermore, the CNKN harvester exhibits a high power density of 12 mW/cm~3 at 93 Hz with a load resistance of 250 kfi; this is similar to the PZT-based energy harvester, indicating that the CNKN ceramic is a good candidate material for energy harvesters.