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KNbO<sub>3</sub> 치환이 (Li,Na,K)(Nb,Sb,Ta)O<sub>3</sub>계 세라믹스의 유전 및 압전 특성에 미치는 영향
노정래,류주현,이상돈,Noh, Jungrae,Yoo, Ju-Hyun,Lee, Sang-Don 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.3
In this study, $KNbO_3$-substituted (Li,Na,K)(Nb,Sb,Ta)$O_3$ ceramics were investigated to develop Pb-free composition ceramics for multilayer actuator and energy harvester applications. The X-ray diffraction analysis indicated that all samples were pure perovskite phase and no secondary phase was found. A tetragonality as a function of $KNbO_3$ substitution showed the maximum value at 1.5 mol% $KNbO_3$ and then decreased. The SEM image analysis showed the maximum grain size of $3.14{\mu}m$ at 1.5mol% $KNbO_3$. In the composition ceramics with 1.5 mol% $KNbO_3$ sintered at $1,100^{\circ}C$, excellent properties of density= 4.75 $g/cm^3$, electromechanical coupling factor ($k_p$)= 0.50 and piezoelectric constant($d_{33}$)= 290 pC/N were obtained, respectively, suitable for piezoelectric actuator and energy harvester applications.