Preparation of Potassium Niobate Nanocrystals by Wet Chemical Reaction at Low Temperature

DOI Web Site 参考文献43件
  • Nakashima Kouichi
    Graduate School Department of Interdisciplinary Research, University of Yamanashi
  • Ueno Shintaro
    Graduate School Department of Interdisciplinary Research, University of Yamanashi
  • Wada Satoshi
    Graduate School Department of Interdisciplinary Research, University of Yamanashi

抄録

The present work describes the preparation of potassium niobate (KNbO3) nanocrystals by wet chemical reaction at low temperature. Nanocube is particularly paid attention in dielectric materials. The KNbO3 have perovskite structure and indicate ferroelectrics property. In this study, preparation of the KNbO3 nanocubes was investigated using solvothermal and microwave reactions. Microwave method enable to the rapidly increasing temperature. 40 mL ethanol was used as reaction medium while 1 mmol niobium oxide (Nb2O5) and 10 mmol potassium hydroxide (KOH) were used as raw materials. The microwave-assisted solvothermal reaction was carried out at 200℃ for 30 minutes. Then, solvothermal reaction was performed at 230℃ for 18 h. The characterization was carried out using X-ray diffraction (XRD) and scanning electron microscopy (SEM). KNbO3 was not obtained from the XRD measurement after the microwave-assisted solvothermal reaction at 200℃ for 30 minutes. However, the main XRD peaks indicated KNbO3 after solvothermal reaction at 230℃ for 18 h. The shape of obtained powders was nanocube from SEM observation. That is to say, KNbO3 nanocubes were obtained by combining microwave and solvothermal reactions.

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