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Preparation of barium titanate ceramics from amorphous fine particles of the Ba–Ti–O system and its dielectric properties

Published online by Cambridge University Press:  03 March 2011

S. Wada ,
T. Suzuki  and
T. Noma
S. Wada
Affiliation:
Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 24–16, Nakamachi 2-chome, Koganei, Tokyo 184, Japan
T. Suzuki
Affiliation:
Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 24–16, Nakamachi 2-chome, Koganei, Tokyo 184, Japan
T. Noma
Affiliation:
Department of Applied Chemistry, Tokyo University of Agriculture and Technology, 24–16, Nakamachi 2-chome, Koganei, Tokyo 184, Japan
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Abstract

Using titanium nitrate solution stabilized by chelation, amorphous fine particles of the Ba-Ti-O system were prepared by the mist decomposition method in air. After calcination of these particles, barium titanate ceramics were prepared using the hot uniaxial pressing method, and various properties were investigated. As a result, the grain sizes could be controlled over the range from 58 nm to 187 nm by the sintering temperatures and/or the calcination temperatures, keeping the density almost constant. Moreover, the dielectric properties of the samples showed that the relative permittivity decreased with decreasing grain size, and Curie temperature also shifted to lower temperatures in the same way. In this study, we first found that Curie temperature existed in the barium titanate ceramics with grain sizes from 58 to 147 nm.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 2 , February 1995 , pp. 306 - 311
Copyright
Copyright © Materials Research Society 1995

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References

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