Hydrothermal synthesis of (K,Na)(Nb,Ta)O3 powder for fabrication of lead-free piezoelectric ceramics

K. J. Zhu; J. H. Qiu; Z. L. Meng; K. Kajiyoshi; K. Yanagisawa; N. Li

doi:10.1117/12.779115

13 November 2007 Hydrothermal synthesis of (K,Na)(Nb,Ta)O₃ powder for fabrication of lead-free piezoelectric ceramics

K. J. Zhu, J. H. Qiu, Z. L. Meng, K. Kajiyoshi, K. Yanagisawa, N. Li

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 642302 (2007) https://doi.org/10.1117/12.779115
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

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 K_0.22Na_0.78NbO₃ exhibited the highest piezoelectric constant of d₃₃ = 120 pC N^-1.

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K. J. Zhu, J. H. Qiu, Z. L. Meng, K. Kajiyoshi, K. Yanagisawa, and N. Li "Hydrothermal synthesis of (K,Na)(Nb,Ta)O₃ powder for fabrication of lead-free piezoelectric ceramics", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 642302 (13 November 2007); https://doi.org/10.1117/12.779115

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