BaCO<SUB>3</SUB>-TiO<SUB>2</SUB>二元系固体反応の速度と機構に及ぼす反応物粒子の凝集の影響
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Mechanism and kinetics of the solid state reaction have. been studied with special emphasis on the effects of aggregation of reactant powder particles. Equimolar mixtures of BaCO<SUB>3</SUB> and TiO<SUB>2</SUB> were prepared by partial precipitation and ball milling methods using two kinds of TiO<SUB>2</SUB> powders with approximately the same ele-mentary particle size in different states of aggregation.<BR>It is shown that BaTiO<SUB>3</SUB> is the only product when fine TiO<SUB>2</SUB> was used but that aggregated TiO<SUB>2</SUB> yielded additional products Ba<SUB>2</SUB>TiO<SUB>4</SUB> and BaTi<SUB>4</SUB>O<SUB>9</SUB>. Disintegration of large TiO<SUB>2</SUB> aggregates by ball-milling decreased the amounts of additional products, and prolonged ball-milling led to substantially the same reaction products and kinetics as those observed with fine TiO<SUB>2</SUB>. No single rate equation has been successfully applied to reaction isotherms obtained with different mixtures. Kinetic behavior has been interpreted in terms of the relative amounts of the reaction products as influenced by the state of aggregation of reactant powder particles.
- 社団法人 粉体粉末冶金協会の論文
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