Evolution of Crystallographic Grain Orientation of (K0.5Na0.5)NbO3 Piezoelectric Ceramics

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The microstructural development of crystalline-oriented (K0.5Na0.5)NbO3 (described as KNN hereafter)-based piezoelectric ceramics during sintering was investigated. The addition of CuO as a sintering aid was found to be effective for fabricating highly oriented and dense KNN ceramics. KNN specimens with 0.5-1.0 mol% CuO sintered at 1100°C for 1 h have both a relative density and a pseudo-cubic {100} orientation degree of 95% or higher. In the early stages of sintering, KNN is formed in the reaction between complementary reactants NaNbO3 and KNbO3, after which oriented grain growth proceeds at a relative density of more than 90%. In addition, the results of TEM observation showed that textured KNN ceramics have a unique pectinate-like domain structure, in which the domain walls consist of {101} planes.

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Periodical:

Edited by:

Keiichi Katayama, Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki

Pages:

3-6

DOI:

10.4028/www.scientific.net/KEM.320.3

Citation:

H. Takao et al., "Evolution of Crystallographic Grain Orientation of (K0.5Na0.5)NbO3 Piezoelectric Ceramics", Key Engineering Materials, Vol. 320, pp. 3-6, 2006

Online since:

September 2006

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$35.00

[1] R. E. Jaeger and L. Egerton, J. Am. Ceram. Soc., 45 (1962), p.209.

[2] Y. Saito, Kokai-Tokkyo-Koho, 2000-313664 [in Japanese]. JP 3, 531, 803 (2004) [in Japanese]. United States Patent 6, 387, 295 (2002).

[3] M. Matsubara, T. Yamaguchi, K. Kikuta and S. Hirano, Jpn. J. Appl. Phys., 43 (2004), p.7159.

[4] Y. Guo, K. Kakimoto and H. Ohsato, Solid State Commun., 129 (2004), p.279.

[5] Y. Guo, K. Kakimoto and H. Ohsato, Jpn. J. Appl. Phys., 43 (2004), No. 9B, p.6662.

[6] Y. Saito, H. Takao, T. Tani, T. Nonoyama, K. Takatori, T. Homma, T. Nagaya and M. Nakamura, Nature, 432 (2004), p.84.

DOI: 10.1038/nature03028

[7] Y. Guo, K. Kakimoto and H. Ohsato, Appl. Phys. Lett., 85 (2004), p.4121.

[8] M. Matsubara, T. Yamaguchi, K. Kikuta and S. Hirano, Jpn. J. Appl. Phys., 44 (2005), p.258.

[9] M. Matsubara, T. Yamaguchi, W. Sakamoto, K. Kikuta, T. Yogo, S. Hirano, J. Am. Ceram. Soc., 88 (2005), p.1190.

[10] M. Matsubara, T. Yamaguchi, K. Kikuta and S. Hirano, Jpn. J. Appl. Phys., 44 (2005), p.6136.

[11] F. K. Lotgering, J. Inorg. Nucl. Chem., 9 (1959).

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