Preparation of textured bismuth titanate ceramics through templated grain growth combined with spark plasma sintering

Keishi Nishio, Rena Maeda, Junsuke Kihou, Yasuo Kogo, Tohru Kineri, Atsuo Yasumori

研究成果: Conference article査読

3 被引用数 (Scopus)

抄録

Textured bismuth titanate (Bi 4Ti 3O 12), the simplest and best known compound among the bismuth layer-structure ferroelectrics is interesting because of its peculiar switching behavior which results from a small c-axis component of the spontaneous polarization and a small coercive force. We prepared Bi 4Ti 3O 12 ceramics through the templated grain growth (TGG) method combined with the spark plasma sintering (SPS) method. The TGG method was developed to provide a simpler way of creating textured ceramic microstructures. The SPS method enables a compact powder to be sintered under uniform heating to a high density at relative low temperatures and with much shorter sintering periods than with conventional sintering. We obtained a Bi 4Ti 3O 12 precursor powder through a co-precipitation method with Ti alkoxide and Bi oxide as raw materials. Platelet Bi 4Ti 3O 12: was synthesized from the precursor powder through a flux method using NaCl and KCl. The obtained platelet Bi 4Ti 3O 12 had a high aspect ratio. The ceramics were prepared by SPS treatment using a mixture of the platelet Bi 4Ti 3O 12 and the amorphous precursor powder. As a result, dense ceramics could be easily obtained without crystalline amorphous precursors and grain growth was not observed during the sintering. After heat treatment of the ceramics, we obtained highly textured, high density Bi 4Ti 3O 12 ceramics. The ceramics showed high orientation, above 70%, for the c-axis direction and high density of over 85%.

本文言語English
論文番号FF3.8
ページ(範囲)127-132
ページ数6
ジャーナルMaterials Research Society Symposium Proceedings
848
出版ステータスPublished - 2005
イベント2004 Materials Research Society Fall Meeting - Boston, MA, United States
継続期間: 29 11月 20042 12月 2004

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