Microstructure, Dielectric and Piezoelectric Properties of (Na, K, Li)(Nb,Sb)O₃ –(Bi, Na)ZrO₃ Ceramics for Piezoelectric Speaker

Abstract

Nowadays, piezoelectric speakers have been actively studied for the applications to smartphone, TV monitor, and car audio system. Accordingly, for developing the piezoelectric speaker composition ceramics, in this paper, (Na,K,Li)(Nb,Sb)O₃–(Bi,Na)ZrO₃ ceramics with Rhombohedral-Tetragonal (R-T) region were fabricated with iron oxide addition, and their piezoelectric characteristics were investigated. When iron oxide was added to the ceramics, d₃₃and k_p were decreased. However, Q_m was increased. At the NKN-BNZ ceramics with 0.1 wt% iron oxide. The piezoelectric constant d₃₃, electromechanical coupling factor kp, and dielectric constant ε_r were optimized as 263[pC/N], 0.450, 1978, respectively, for piezoelectric speaker application.

Keywords:

• Rhombohedral-Tetragonal (R-T) region
• (NaK)NbO₃
• Iron oxide
• Piezoelectric speaker
• Piezoelectric constant(d₃₃)

Acknowledgements

This paper was studied by 2016 National Research Foundation of Korea