Effect of DC Poling Field on Domain Behavior in Lead-Free Piezoelectric Ceramics

摘要

Poling characteristics, especially DC poling field (E) dependence of dielectric and piezoelectric properties were investigated to evaluate the domain behavior in lead-free ceramics such as alkali niobate and alkali bismuth titanate ceramics. The domain switching was confirmed by the E to realize minimum dielectric constant (ε_r), minimum electromechanical coupling factor (k) and maximum frequency constant (f_c), because of domain clamping. On the other hand, the domain rotation occurred at the E to obtain maximum ε_r and minimum f_c. These phenomena are observed in the lead-free ceramics as well as PZT ceramics.