(K, Na)NbO3-based Lead-free Piezoceramics: Status, Prospects and Challenges

The past decade has witnessed the rapid development of (K, Na)NbO3 (KNN)-based lead-free piezoceramics. The present article reviews the current status of this system, with special emphasis on crystalline structure, piezoelectric performance and processing technologies based on the authors’ research work. In addition, the prospects and challenges are also analyzed according to the authors’ knowledge.