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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.123  No.1437 (May) (2015)  >  pp.340-344

Journal of the Ceramic Society of Japan
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Crystal-oriented (Bi0.5, Na0.5)0.85–Ba0.15TiO3 ceramics prepared by colloidal processing in rotating high magnetic field

Satoshi TANAKA1), Keisuke SANO1), Mitsuru IMAI1), Keizo UEMATSU1), Tomohiro HARADA2), Yutaka DOSHIDA2)
1) Department of Materials Science and Technology, Nagaoka University of Technology 2) R&D Center, Taiyo Yuden Co. Ltd.

Crystal-oriented (Bi0.5, Na0.5)0.85–Ba0.15TiO3 (BNBT15) ceramics with a perovskite crystal structure were prepared by colloidal processing in a rotating high magnetic field to improve their piezoelectric properties. The presence of BaTiO3 leads to anisotropic crystal lattices, allowing crystal-oriented BNBT15 ceramics to be successfully fabricated, using a rotating magnetic field to orient the c- and a-axes of the crystal in the powder compact. The phase transformation that occurred during sintering redistributed the c-axis oriented structure along both the a- and c-axes. Again, the c-axis was enhanced by electrical field polarization. A piezoelectric constant of 122 pC/N was obtained, which is larger than the 88 pC/N of BNBT ceramics.

Piezoelectric material, Orientation

Received: November 30, 2014
Accepted: February 11, 2015 , Published online: May 01, 2015



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