Dielectric and piezoelectric properties of 0.965(Na_0.5K_0.5)_0.97Li _0.03(Nb_0.96Sb_0.04)O₃-0.035(Bi_0.5Na_0.5)_0.9(Sr)_0.1ZrO₃ ceramics with CuO addition

Abstract

Recently, piezoelectric speakers have been widely researched for smartphone application. Accrordingly, in this study, in order to develop the low temperature sintering Pb-free ceramics, the 0.965(Na_0.5K_0.5)_0.97Li_0.03(Nb_0.96Sb_0.04)O₃-0.035(Bi_0.5Na_0.5)_0.9(Sr)_0.1ZrO₃ ceramics for these devices were manufactured as a function of CuO addition and the their physical properties were investigated. At the manufactured ceramics, the coexistence phases of rhombohedral and tetragonal(R-T) phase were appeared. An average grain size of the specimen increased according to the increase of CuO addition until 1.5 mol% due to the formation of a liquid phase. The composition ceramics added with 2 mol% CuO showed the excellent physical properties of density = 4.496g/cm³, k_p = 0.391, Q_m = 88, ε_r = 1705, and d₃₃ = 241pC/N. These results show that the ceramics added with 2 mol% CuO is an attractive candidate for lead-free piezoelectric actuator application.

Keywords:

• 0.965(Na_0.5K_0.5)_0.97Li_0.03(Nb_0.96Sb_0.04)O₃
• lead-free
• CuO
• piezoelectric ceramics

Acknowledgement

This paper was studied by 2017 National Research Foundation of Korea.