(1-x)K 0.5 Na 0.5 Ta 0.1 Nb 0.9 O 3 +xBaTiO 3 Lead-Free Piezoelectric Ceramics Ching-Hsing Pei 1 , Kai-Huang Chen 2 , Ming-Chang Kuan 2 , Chun-Kai Wang 1 , Chien-Min Cheng 1* 1 Department of Electronic Engineering, Southern Taiwan University of Science and Technology, Tainan, Taiwan, R.O.C. 2 Department of Electronics Engineering and Computer Science, Tung-Fang Design University, Kaohsiung, Taiwan, R.O.C. By the conventional solid state reaction method, lead-free K 0.5 Na 0.5 Ta 0.1 Nb 0.9 O 3 and BaTiO 3 ceramics were calcined, respectively. And according to the composition of (1-x)K 0.5 Na 0.5 Ta 0.1 Nb 0.9 O 3 + xBaTiO 3 (x=0~0.1), the calcined ceramics were weighted, mixed, grounded, and sintered between 1100 and 1200 C in the air. In addition, we used BaTiO 3 ceramics to low down the Curie temperature (T C ) of K 0.5 Na 0.5 Ta 0.1 Nb 0.9 O 3 ceramics. From the measured results, it can be observed that as the content of BaTiO 3 (x values) increased, the Curie temperature decreased obviously from 390 to 290 C. The orthogonal to tetragonal phase transition temperature (T O-T ) also decreased as the BaTiO 3 content increased. The relative permittivity ε r for the KNN-BTZ-x ceramics increase with the content of BaTiO 3 (x values) increased. The 2 th International Conference on Advanced Electromaterials (ICAE 2013) SEM images of the KNN-BTZ-x ceramics Composition dependences of the KNN-BTZ-x ceramics with 0≦x≦0.1 XRD patterns of the KNN-BTZ-x ceramics (a) X=0, 1100 ℃ (b) X=0.025, 1140 ℃ (c) X=0.05, 1140 ℃ (d) X=0.05, 1170 ℃ (e) X=0.075, 1200 ℃ (c) X=0.1, 1200 ℃ T C and T O-T characteristics of the KNN- BTZ-x ceramics 0 0.025 0.05 0.0 7 5 0.1 X 0 100 200 300 400 50 150 250 350 T em p e ra tu re ( C) T C T O -T