Defect-driven conductivity behavior in lead-free KNN-based ceramics

Defect-driven properties of lead-free piezoelectric materials have become the focus of research as a result of in-depth investigations into such materials. Here, we pay special attention to the conductivity mechanism of 0.91K0.5Na0.5NbO3–0.05Ag1 − xNaxSbO3–0.04Bi0.5Na0.5ZrO3 ceramics. The charge carrier concentration induced by defects, which exerts an effect on conductivity, displays different mechanisms under different temperatures. By...