Piezoelectric Properties Study of KNN-LS Lead-free Ceramics Synthesized by Sol-gel Method

Morphotropic phase boundary(MPB)composition, KNaNbO3-0.052LiSbO(3)(KNN-LS) was synthesized by sol-gel method at this experiment. Sb2O3 was used as economic Sb source and the final dried gel was calcined at 650 degrees C for 2h to obtain white nano-powder. The sintering experiment was carried out at the temperature range of 980 degrees C-1130 degrees C, and perovskite phase structure could be observed apparently below 1080 degrees C When the temperature reached 1080 degrees C and above, the second phase Na3LiNb6O17 appeared meanwhile the piezoelectric coefficient(d(33)) decreased quickly. It's proven that fine-grained particles and low sintering temperature could be obtained in sol-gel route.