Abstract
Potassium-sodium niobate (K1-xNaxNbO3, referred to as KNN) solid solutions, which are an important type of lead-free piezoelectric materials possessing environmentally friendly features, good piezoelectric response and high Curie temperature, have attracted considerable attention in replacing lead-based ceramics. In order to promote the application of KNN-based ceramics in piezoelectric devices, we characterized a complete set of material constants of a high performance KNN-based ceramic, that is 0.965(K0.48Na0.52) (Nb0.96Sb0.04)O3-0.035Bi0.5Na0.5Zr0.15Hf0.75O3 (KNNS-BNZH), whose Curie temperature is 235 °C, piezoelectric coefficient d33 is 380 pC/N and electromechanical coupling factor k33 is 70%. These results will benefit the design of piezoelectric transducers and actuators using lead-free piezoelectric ceramics.
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