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Proceedings Paper

Hydrothermal synthesis of (K,Na)(Nb,Ta)O3 powder for fabrication of lead-free piezoelectric ceramics
Author(s): K. J. Zhu; J. H. Qiu; Z. L. Meng; K. Kajiyoshi; K. Yanagisawa; N. Li
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Paper Abstract

Hydrothermal method was used to synthesize (K,Na)(Nb,Ta)O3 powders with the addition of isopropanol. The phases of the obtained powders were identified by XRD. The morphology and particle size were observed by FE-SEM. The presence of water and organic group were determined by (FTIR) spectroscopy. The results indicate that the pure (K,Na)(Nb,Ta)O3 powders with perovskite structure and fine particles were successfully synthesized by hydrothermal method at 240 °C for 8 hours with the addition of isopropanol. With the increase of Ta content in the starting materials, the Ta/(Ta+Nb) molar ratios increased in the products. With increase of K content in the starting solutions, the morphology of the obtained crystals varied, and the K content in the products increased. The K/(K+Na) molar ratio in the products is lower than that in the staring solutions. The specimen with the composition of K0.22Na0.78NbO3 exhibited the highest piezoelectric constant of d33 = 120 pC N-1.

Paper Details

Date Published: 13 November 2007
PDF: 7 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 642302 (13 November 2007); doi: 10.1117/12.779115
Show Author Affiliations
K. J. Zhu, Nanjing Univ. of Aeronautics and Astronautics (China)
J. H. Qiu, Nanjing Univ. of Aeronautics and Astronautics (China)
Z. L. Meng, Nanjing Univ. of Aeronautics and Astronautics (China)
K. Kajiyoshi, Kochi Univ. (Japan)
K. Yanagisawa, Kochi Univ. (Japan)
N. Li, Kochi Univ. of Technology (Japan)


Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering

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