Abstract: Ternary system piezoelectric ceramic materiais 0.98K0.5 Na0.5 NbO3-0.02LiNbO3 -xCeO2 (0. 98KNN-0.02LN+xCeO2 ) were fabricated using solid state sintered technology .The effects of additive contents ranging from 0.00 to 4mol; on structural characteristics and electrical properties of 0.98K0.5 Na0.5 NbO3-0.02LiNbO3 lead-free piezoelectric ceramics doped with CeO 2 were investigated.The crystal structure of the ceramics changes from orthorhombic phase to tetragonal phase when content of CeO 2 change from x =0.00 to x =0.01 and x =0.02 to x =0.04, and the coexistence of orthorhombic-tetragonal phases are observed when x=0.00 and x=0.02.The results show that when adding a small amount of CeO 2 , it show the characteristics of the acceptor doping and when adding amount of CeO 2 , results show the characteristics of the sintering additives .The optimization comprehensive property was at the addition of 2mol;CeO2 sinter temperature 1080℃.The main parameters for the composition of x=0.02 are:d33 =104 pC/N, Qm =2201, kp =0.24423,εr =804.2, tanδ=8.748;.

Key words: Ternary system piezoelectric ceramic materiais 0.98K0.5 Na0.5 NbO3-0.02LiNbO3 -xCeO2 (0. 98KNN-0.02LN+xCeO2 ) were fabricated using solid state sintered technology .The effects of additive contents ranging from 0.00 to 4mol; on structural characteristics and electrical properties of 0.98K0.5 Na0.5 NbO3-0.02LiNbO3 lead-free piezoelectric ceramics doped with CeO 2 were investigated.The crystal structure of the ceramics changes from orthorhombic phase to tetragonal phase when content of CeO 2 change from x =0.00 to x =0.01 and x =0.02 to x =0.04, and the coexistence of orthorhombic-tetragonal phases are observed when x=0.00 and x=0.02.The results show that when adding a small amount of CeO 2 , it show the characteristics of the acceptor doping and when adding amount of CeO 2 , results show the characteristics of the sintering additives .The optimization comprehensive property was at the addition of 2mol;CeO2 sinter temperature 1080℃.The main parameters for the composition of x=0.02 are:d33 =104 pC/N, Qm =2201, kp =0.24423,εr =804.2, tanδ=8.748;.