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Preparation of lead-free piezoelectric (K0.5Na0.5)NbO3 nanopowder by a simple aqueous route

John G. Fisher|Kwi-Hak Lee|Won-Jin Moon
청정에너지연구소 (Clean-Energy Research Institute)|2020.05|Journal of Ceramic Processing Research|제21권 제1호|pp. 5-13|DOI 10.36410/jcpr.2020.21.1.5

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키워드

microstructure.(K0.5Na0.5)NbO3nanopowderlead-free piezoelectric
주제분류재료공학

초록

(K0.5Na0.5)NbO3-based ceramic powders for lead-free piezoelectric applications are usually prepared by solid state synthesis. This generally involves wet ball milling in an organic liquid such as ethanol, which is a drawback for industrial production. In the present work, a method for the preparation of NaNbO3 nanopowders is modified to produce a simple method ofpreparing (K0.5Na0.5)NbO3 nanopowders by an aqueous route. K2CO3, Na2CO3 and NH4[NbO(C2O4)2].xH2O are mixed inwater and dried to form a gel, which is then calcined at temperatures between 400 ~ 650 °C for 1 h. The uncalcined gel andcalcination products are analysed using Thermogravimetric Analysis/Differential Thermal Analysis, X-ray Diffraction, FourierTransform Infrared Spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy and Raman Scattering. A single phase tetragonal (K0.5Na0.5)NbO3 nanopowder with a particle size of ~ 30 nm can be produced after calcination at650 °C for 1 h.

Abstract

(K0.5Na0.5)NbO3-based ceramic powders for lead-free piezoelectric applications are usually prepared by solid state synthesis. This generally involves wet ball milling in an organic liquid such as ethanol, which is a drawback for industrial production. In the present work, a method for the preparation of NaNbO3 nanopowders is modified to produce a simple method ofpreparing (K0.5Na0.5)NbO3 nanopowders by an aqueous route. K2CO3, Na2CO3 and NH4[NbO(C2O4)2].xH2O are mixed inwater and dried to form a gel, which is then calcined at temperatures between 400 ~ 650 °C for 1 h. The uncalcined gel andcalcination products are analysed using Thermogravimetric Analysis/Differential Thermal Analysis, X-ray Diffraction, FourierTransform Infrared Spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy and Raman Scattering. A single phase tetragonal (K0.5Na0.5)NbO3 nanopowder with a particle size of ~ 30 nm can be produced after calcination at650 °C for 1 h.

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