Abstract
In this study, in order to develop excellent lead-free composition ceramics for piezoelectric transformer, (<TEX>$K_4CuNb_8O_{23}$</TEX>) added <TEX>$(K_{0.5}Na_{0.5})(Nb_{0.96}Sb_{0.04})O_3$</TEX> ceramics were fabricated using conventional mixed oxide method and their piezoelectric and dielectric properties were investigated as a fu+EY50nction of the amount of KCN addition. With increasing the amount of KCN addition, density and mechanical quality factor(Qm), electromechanical coupling factor (Kp) were increased up to 1.2 mol% and then decreased. At the 1.2 mol% KCN added specimen, mechanical quality factor (Qm), electromechanical coupling factor (Kp), density and dielectric constant (<TEX>${\varepsilon}r$</TEX>) showed the optimal values of 781, 0.445, <TEX>$4.42\;g/cm^3$</TEX> and 443, respectively, for piezoelectric transformer application.
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