Journal of Ceramic Processing Research

Ceramic Processing Research Center (한양대학교 세라믹연구소)
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Preparation of lead-free piezoelectric (K0.5Na0.5)NbO3 nanopowder by a simple aqueous route

  • John G. Fisher (Chonnam National University) ;
  • Kwi-Hak Lee (Chonnam National University) ;
  • Won-Jin Moon (Korea Basic Science Institute)
  • Published : 20200000
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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 of preparing (K0.5Na0.5)NbO3 nanopowders by an aqueous route. K2CO3, Na2CO3 and NH4[NbO(C2O4)2].xH2O are mixed in water and dried to form a gel, which is then calcined at temperatures between 400 ~ 650 ℃ for 1 h. The uncalcined gel and calcination products are analysed using Thermogravimetric Analysis/Differential Thermal Analysis, X-ray Diffraction, Fourier Transform 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 at 650 ℃ for 1 h.

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Acknowledgement

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education under Grant number: 2015R1D1A1A01057060. The authors would like to thank Kyeong-Kap Jeong and Jeong-Chi Sang (Centre for Research Facilities, Chonnam National University) for operating the XRD and FTIR, Hey-Jeong Kim (Centre for Development of Fine Chemicals, Chonnam National University) for operating the SEM and Dr. Sang-Hun Jeong and Kang- Min Lee (Korea Basic Science Institute, Gwangju centre) for carrying out the Raman scattering and slow- scan XRD experiments respectively.