Piezoelectric and Dielectric Characteristics of Lead-free (Na,K)NbO 3 Piezoelectric Ceramic System according to Calcination Temperature

In this paper, in order to develop lead-free piezoelectric ceramics, ceramics were fabricated with the variation of calcination temperature and sintering temperature. The ceramics couldn`t be sintered at temperature less than and showed the highest density at calcination temperature of . Crystal structure of the ceramics showed pseudo-tetragonal phase. At the calcination temperature of and sintering temperature of , the optimal values of $density