Solid-state reactions between CVD-TiO2 and BaCO3.
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概要
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The solid-state reactions between CVD–TiO<SUB>2</SUB> powders of anatase- and rutile-forms with various particle sizes and BaCO<SUB>3</SUB> were investigated in O<SUB>2</SUB> and CO<SUB>2</SUB>. The reactivity of the TiO<SUB>2</SUB> powders and the apparent activation energy for the reaction were independent of the crystal type of TiO<SUB>2</SUB>. The reactivity of the TiO<SUB>2</SUB> powders increased remarkably as the particle sizes grew smaller than 0.15 μm. When such fine CVD–TiO<SUB>2</SUB> powders were used, the reaction proceeded to completion at temperatures below 1000 °C in both O<SUB>2</SUB> and CO<SUB>2</SUB> and gave fine BaTiO<SUB>3</SUB> powders. The particles of BaTiO<SUB>3</SUB> produced appeared single-crystalline and kept a shape similar to that of the starting TiO<SUB>2</SUB> particle. The sizes of the BaTiO<SUB>3</SUB> particles were controlled by those of the starting TiO<SUB>2</SUB> and were independent of those of BaCO<SUB>3</SUB>.
- 公益社団法人 日本化学会の論文
著者
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Kato Akio
Department Of Agricultural Chemistry Faculty Of Agriclture Yamaguchi University
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Suyama Yoko
Department of Applied Chemistry, Faculty of Engineering, Kyushu University
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