Physical and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3-(Bi0.5Na0.5)TiO3 Ceramics
Lead-free (1-x)(Na0.5K0.5)NbO3-x(Na0.5Bi0.5)TiO3 (x=0.02, 0.04, 0.06, 0.08, and 0.10) ceramics have been prepared by the conventional mixed oxide process. For 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3 ceramics, the electromechanical coupling coefficients of the planar mode kp and the thickness mode kt reach 0.33 and 0.62, respectively, after sintering at 1100°C for 5 h. The ratio of the thickness coupling coefficient to the planar coupling coefficient is 1.88. Our results show that 0.98(Na0.5K0.5)NbO3-0.02(Na0.5Bi0.5)TiO3 solid solution ceramics are promising lead-free ceramics for high-frequency electromechanical transducer applications.
Daoguo Yang, Tianlong Gu, Huaiying Zhou, Jianmin Zeng and Zhengyi Jiang
C. H. Wang "Physical and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3-(Bi0.5Na0.5)TiO3 Ceramics", Advanced Materials Research, Vols. 201-203, pp. 2772-2775, 2011