Shear-Mode Piezoelectric Properties of KNbO3-Based Ferroelectric Ceramics

概要

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Potassium niobate, KNbO3, (KN)-based ceramics were prepared by a modified conventional ceramic fabrication process to characterize their piezoelectric properties. The KN–MnCO3 0.1 wt % (KN–Mn0.1) ceramic used in this study showed a high density ratio ${>}96$% and a high resistivity, $\rho$, of about $10^{13}$ $\Omega$$\cdot$cm without deliquescent properties. The shear mode of the KN–Mn0.1 ceramic showed excellent resonance and antiresonance characteristics with tiny spurious peaks upon optimization of the sample dimensions. The electromechanical coupling factor, $k_{15}$, and piezoelectric strain constant, $d_{15}$, of KN–Mn0.1 showed relatively large values of 0.55 and 207 pC/N, respectively. The shear-mode vibration of KN-based ceramics appears to be a very promising candidate for actuators and high-power applications.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2009-07-25