Abstract
(1-X) <TEX>$(Na_{0.5}K_{0.5})NbO_3-X$</TEX> <TEX>$K_4CuNb_8O_{23}$</TEX> (NKN-X KCN) ceramics were produced using the conventional solid state sintering method, and their sinterability and electric properties were investigated. The density, dielectric constant (<TEX>${\varepsilon}_r$</TEX>), piezoelectric constant <TEX>$d_{33}$</TEX>, electromechanical coupling factor <TEX>$k_p$</TEX> and mechanical quality factor <TEX>$Q_m$</TEX> value of the NKN ceramics depended upon the KCN content and the sintering temperature. In particular, the KCN addition to the NKN greatly improved the mechanical quality factor <TEX>$Q_m$</TEX> value. The ceramic with X = 2.0 mol% sintered at <TEX>$1,150^{\circ}C$</TEX> possesses the optimum properties (<TEX>${\varepsilon}_r=241$</TEX>, <TEX>$d_{33}=78$</TEX>, <TEX>$k_p=0.34$</TEX> and <TEX>$Q_m=1,121$</TEX>). These results indicate that the ceramic is a promising candidate material for applications in lead free piezoelectric transformer and filter materials.
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