Nondoped Potassium Niobate Ceramics Synthesized by Hydrothermal Method with Optimum Temperature Condition

概要

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Nondoped potassium niobate (KNbO3) ceramics were synthesized with fine powders obtained by a hydrothermal method. The hydrothermal method employs a chemical reaction in a solution. Low reaction temperature and self-assembly growth resulted in high-quality KNbO3 powders. In this study, various temperature conditions from 180 to 230 °C were examined for high-performance KNbO3 ceramics. After sintering at 1030 °C using hydrothermally crystal powders under respective conditions, the dielectric loss and permittivity of each ceramic were measured. As a result, the suitable temperature condition of the hydrothermal synthesis for piezoceramics was 210 °C. With admittance measurements, the piezoelectric performance of fabricated KNbO3 ceramics was confirmed. From the resonance frequency response corresponding to the radial vibration and thickness vibration modes, the coupling factors $k_{\text{r}}$ and $k_{\text{t}}$ and the piezoelectric constants $d_{31}$ and $d_{33}$ were measured to be 0.14 and 0.26, and $-28$ and 55 pm/V, respectively.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2008-05-25