A Study on the Characteristics of (Na,K)$NbO_3$-system Pb-free Piezoelectric Ceramics with Calcination Temperature

하소온도 변화에 따른 (Na,K)$NbO_3$계 무연 압전세라믹스의 특성에 관한 연구

In this paper, in order to develop Pb-free piezoelectric ceramics, $(Li_{0.04}Na_{0.44}K_{0.52})(Nb_{0.86}Ta_{0.10}Sb_{0.04})O_3$ ceramics were fabricated with the variation of calcination temperature and sintering temperature. Specimens couldn't be sintered below $111^{\circ}C$ and showed the largest density at calcination temperature of $800^{\circ}C$. Specimens manufactured with the variation of calcination temperature showed pseudo-tetragonal phase, and showed the optimal values of kp=0.45, ${\varepsilon}r$=1336 and $d_{33}$=254 at calcination temperature of $800^{\circ}C$ and sintering temperature of $1110^{\circ}C$.