Abstract
In this study, lead-free pirzoelectric ceramics were investigated for pressure sensor applications as a function of the amount of <TEX>${La}_2{O}_3$</TEX> addition at <TEX>$Bi(Na, K)Ti{O}_3-SrTi{O}_3$</TEX>system. With increasing the amount of addition, the density and dielectric constant increased up to 0.9 wt% <TEX>${La}_2{O}_3$</TEX> addition and decreased above 0.9 wt% <TEX>${La}_2{O}_3$</TEX>addition. Electromechanical coupling factor( <TEX>$K_{P}$</TEX>) showed the maximum value at 0.2 wt% <TEX>${La}_2{O}_3$</TEX>addition and decreased above 0.2 wt% <TEX>${La}_2{O}_3$</TEX> addition. Electromechanical coupling <TEX>$factor{(K)}_P$</TEX>, density, dielectric constant<TEX>$(\varepsilon_\Gamma)$</TEX>, piezoelectric constant<TEX>$(d_33)$</TEX> and curie temperature<TEX>$(T_C)$</TEX> showed optimum value of 0.40, 5.75 g/㎤, 768, 215 pC/N and 320 <TEX>$^{\circ}C$</TEX> at 0.2 wt%<TEX>${La}_2{O}_3$</TEX>addition, respectively.
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