Dielectric and Piezoelectric Properties of Pb-free Bi(Na, K)TiO 3 -SrTiO 3 Ceramics with MnO 2 Addition

In this study, 0.96B ( )Ti + 0.04SrTi + 0.3 wt% N +0.2 wt% L + xwt % Mn were investigated as a function of the amount of Mn addition in order to improve dielectric and piezoelectric properties of Lead-free piezoelectric ceramics. With increasing the amount of Mn addition, the density, electromechanical coupling factor( ), piezoelectric constant( , ) and curie temperature (Tc) showed the maximum value of 5.7 g/㎤, 38 %, 219 pC/N, 26 mVㆍm/N and 32 at 0.1 wt% Mn addition, respectively, and mechanical quality factor( ) showed the maximum value of 158 at 0.3 wt% Mn addition.ddition.ion.n.