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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.122  No.1421 (January) (2014)  >  pp.58-62

Journal of the Ceramic Society of Japan
<<Previous article Vol.122  No.1421 (January) (2014)   pp.58 - 62 Next article>>

Grain orientation of Nd-modified bismuth titanate ceramics by forming at low magnetic field

Yuya KOMATSU1), Tetsuo UCHIKOSHI2), Hidenobu ITOH3), Junichi TAKAHASHI1)
1) Faculty of Engineering, Hokkaido University 2) Advanced Key Technologies Division, National Institute for Materials Science 3) Department of Materials Science, Kitami Institute of Technology

Grain-oriented Nd-modified bismuth titanate (BNIT) ceramics with the a-b-plane perpendicular to the direction of magnetic field (MF) were successfully fabricated by applying MF-assisted forming at lower field strengths. A BNIT powder, in which 25% of the Bi3+-site were substituted with Nd3+, was synthesized by coprecipitation in an alkaline solution and successive calcination at 600°C. Green compacts of the BNIT powder were formed by applying various MF strengths (2–12 T) during slip casting and then sintered at 900 and 1000°C for different times. The cation substitution with Nd3+ allowed very fine BNIT particles in a slurry to be magnetically aligned at lower field strengths. For BNIT ceramics sintered at 1000°C, the degree of grain orientation increased with increasing MF according to the parabolic relationship. Additionally, the grain orientation was enhanced by the preferential growth of anisotropic BNIT grains occurring at later stage of the sintering.


Keyword:
Bi4Ti3O12, Cation substitution with Nd3+, Magnetic-field-assisted forming, Grain orientation, Preferential grain growth

Received: August 21, 2013
Accepted: November 12, 2013 , Published online: January 01, 2014
Copyright © 2014 The Ceramic Society of Japan

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