Hydrothermal Synthesis and Microwave Sintering of (K0.5Na0.5)NbO3 Ceramics
Lead-free piezoelectric ceramics of (K0.5Na0.5)NbO3 (KNN) were produced by using hydrother-mally synthesized KNbO3 (KN) and NaNbO3 (NN) powders in a microwave furnace to reduce the volatilization of the alkaline elements. The KNN ceramics were synthesized by using a hydrothermal KN and NN mixed powder, a 1 mol％ CuO-added hydrothermal KN and NN mixed powder and KNN calcined at various temperatures. The hydrothermal KN and NN powder and the calcined KNN powder had a pure perovskite phase while KNN ceramics with 1 mol％ CuO showed a pyrochlore second phase. The CuO-added KNN ceramics sintered at 1050 ℃ for a short sintering time of 5 min at a fast heating rate of 50 ℃/min to prevent evaporation of K2O and Na2O showed the highest piezoelectric properties (D33 = 89 pC/N and kp = 0.28). The X-ray diffraction and the scanning electron microscopy results indicate that fast heating and short sintering time can affect the phase formation sequence in KNN ceramics.
Hydrothermal Piezoelectrics Microwave sintering Lead-free
Dae-Yong Jeong Seong-Hwa Lee Hyun-Cheol SONG Kyeong-Ho Choi Jin-Ho Cho
Department of Materials Science and Engineering, Myongji University, Yongin 449-728, Korea Electronic Materials Center, Korea Institute of Science and Technology, Seoul 136-791, Korea Department of Green Chemistry & Manufacturing,Korea Institute of Industrial Technology, Cheonan 330- Department of Nano-Materials and Engineering, Myongji University, Yongin 449-728, Korea
国际会议
首尔
英文
663-667
2010-02-07（万方平台首次上网日期，不代表论文的发表时间）