Physical and Electrical Properties of Lead-Free (Na_0.5K_0.5)NbO₃-(Bi_0.5Na_0.5)TiO₃ Ceramics

Abstract:

Lead-free (1-x)(Na_0.5K_0.5)NbO_3-x(Na_0.5Bi_0.5)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(Na_0.5K_0.5)NbO₃-0.02(Na_0.5Bi_0.5)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(Na_0.5K_0.5)NbO₃-0.02(Na_0.5Bi_0.5)TiO₃ solid solution ceramics are promising lead-free ceramics for high-frequency electromechanical transducer applications.

• Periodical: Advanced Materials Research (Volumes 201-203)
• Pages: 2772-2775
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.201-203.2772
• Online since: February 2011
• Authors: Chun Huy Wang
• Keywords: Dielectric Property, Electromechanical Transducer, Lead-Free Piezoelectric, Piezoelectric Properties, Poling, Sintering

References

[1] S. Y. Chu, W. Water, Y.D. Juang, J. T. Liaw, and S. B. Da: Ferroelectrics, Vol. 297 (2003), p.11.

[2] M. Matsubara, T. Yamaguch, and S. Hirano: Jpn. J. Appl. Phys. Vol. 44 (2005), p.6136.

[3] M. D. Maeder, D. Damjanovic and N. Setter: J. Electroceram., Vol. 13 (2004), p.385.

[4] Y. Guo, K. Kakimoto, and H. Ohsato: Jpn. J. Appl. Phys. Vol. 43, (2004), p.6662.

[5] C. H. Wang: J. Ceram. Soc. Jpn. Vol. 117, (2009), p.680.

[6] Y. Guo, K. Kakimoto, and H. Ohsato: Appl. Phys. Lett. Vol. 85, (2004), p.4121.

[7] Y. Guo, K. Kakimoto, H. Ohsato: Mater. Lett. Vol. 59, (2005), p.241.

[8] Y. Guo, K. Kakimoto, and H. Ohsato: Solid State Commun., Vol. 129, (2004), p.279.

[9] R. C. Chang, S. Y. Chu, C. S. Hong and Y. P. Wong: J. Eur. Cerm. Soc. Vol. 27, (2007), p.4453.

[10] C. H. Wang: J. Ceram. Soc. Jpn. Vol. 116, (2008), p.632.

[11] Anon. IRE: Proc. IRE., Vol. 49 (1961), p.1161.