Fabrication and Electrical Properties of Potassium Niobate Ferroelectric Ceramics

概要

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Potassium niobate, KNbO3 (KN), ceramics were prepared by a modified conventional ceramic fabrication process to characterize their piezoelectric properties. The modified process involving two-stage calcination (first stage at 600 °C and second stage at 1000 °C) is very effective in obtaining KN ceramics with a high density ratio ${>}96$% and a high resistivity, $\rho$, of ${>}10^{12}$ $\Omega$$\cdot$cm and that are nondeliquescent. The KN ceramics showed good piezoelectric properties in terms of the electromechanical coupling factor, $k_{33}$, the piezoelectric constant, $d_{33}$, and the mechanical quality factor, $Q_{\text{m}}$, which are 0.49, 91.7 pC/N, and 325, respectively. They were poled at a DC electric field of 5 kV/mm at 150 °C.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-10-30