Syntheisis and Characterization of Bismuth Tungstate Crystals by Solution Growth Technique

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Growth of ferroelectric Bi2WO6 (BWO) mono-domain bulk crystals was attempted by the vertical-Bridgman (VB) method below the phase transition (ferro- to paraelectric) temperature of 940oC using Li2B4O7 as a flux. In this method, Pt crucibles with different shapes were used. The crucible with a wedged tip bottom produced BWO crystal with a thickness of over 4 mm along the crystallographic c-axis (perpendicular to the spontaneous polarization axis). Using BWO mono-domain crystals grown by slow cooling technique, on the other hand, their electric properties were characterized. The dielectric constants, ε ij, and electromechanical coupling factor, k33, of the crystals were 70-100 and 36% at room temperature, respectively.

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Edited by:

K. Katayama, K. Kato, T. Takenaka, M. Takata and K. Shinozaki

Pages:

81-84

Citation:

M. Nishida et al., "Syntheisis and Characterization of Bismuth Tungstate Crystals by Solution Growth Technique", Key Engineering Materials, Vol. 350, pp. 81-84, 2007

Online since:

October 2007

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[1] B. Aurrivillius, Arikiv Kemi, 1 (1949) p.463 and p.519.

[2] A. D. Rae, J. G. Thompson, and R. L. Withers, Acta Cryst., B47 (1991), p.870.

[3] H. Takeda, T. Nishida, S. Okamura and T. Shiosaki, J. Euro. Ceram. Soc., 25 (2005), p.2731.

[4] R. W. Wolfe, N. E. Newnahm, and M. I. Kay, Solid State Comm., 7 (1969), p.1797.

[5] H. W. Newkirk, P. Quadflieg, J. Liebertz, and A. Kockel, Ferroelectrics, 4 (1972), p.51.

[6] V. K. Yanovskii and V. I. Voronkova, Phys. Stat. Sol. (a), 93 (1986) p.57.

[7] IEEE Standard on Piezoelectricity 176-1987 (1987).

[8] N. Nagasawa, A. Machida, T. Ami, and M. Suzuki, J. Ceram. Soc. Jpn., 106 (1998), p.477.

[9] R. Aoyagi, H. Takeda, S. Okamura, and T. Shiosaki, Jpn. J. Appl. Phys., 40 (2001), p.5671.

[10] M. Matsushita, R. Aoyagi, H. Takeda, S. Okamura, and T. Shiosaki, Jpn. J. Appl. Phys., 43 (2004), p.7164.

[11] T. Takenaka: PhD. thesis, Faculty of Engineering, Kyoto Univ. (1984) [in Japanese].

[12] T. Takenaka and K. Sakata, Ferroelectrics, 94 (1989), p.175. e-mail: hiro-t@ms. naist. jp Fax: 0743-72-6063, http: /www. naist. jp.