Effect of Crystal-Axis Orientation on Dielectric Properties of Ceramics Prepared from Fibrous Barium Titanate |
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| Authors: | Yoshinobu Ohara Kunihito Koumoto Hiroaki Yanagida |
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| Affiliation: | Ceramics Research Department, Central Research Laboratory, Sekisui Plastics Co., Ltd., Morimoto-cho 670, Tenri-city, Nara 632, Japan;Department of Applied Chemistry, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464–01, Japan;Department of Industrial Chemistry, Faculty of Engineering, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan |
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| Abstract: | Barium titanate (BaTiO3) ceramics with high degrees of a- and c -axis orientation were fabricated by combining hydrothermal synthesis of fibrous particles, formation of green compacts with aligned extruded rods in the mold, and normal sintering. The orientation of crystal axes in such ceramics gives rise to high dielectric permittivity. Ceramics with an orientation degree f =76% showed values of ε/ε0 which are 1.5 times (ε/ε0= 2700) as large as those of a randomly oriented (commercial) ceramic (ε/ε0= 1800). |
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