BaCO<SUB>3</SUB>とTiO<SUB>2</SUB>の反応の速度論的研究

DOI Web Site

書誌事項

タイトル別名
  • Kinetics of the Reaction between BaCO<SUB>3</SUB> and TiO<SUB>2</SUB>
  • BaCO3 ト TiO2 ノ ハンノウ ノ ソクドロンテキ ケンキュウ

この論文をさがす

説明

The reaction between BaCO3 and TiO2 has been studied in air and in CO2 at 700-1020°C. Several products (Ba2TiO 4, BaTiO3, BaTi3O7, and BaTi4O9) were obtained when the mixtures of BaCO3 and TiO2 were heated in air, but, under the CO2 atmosphere of 300-700mm Hg, BaTiO3 with very small amounts of BaTi3O7 was observed.<BR>The kinetics of the reaction between BaCO3 and TiO2 under the CO2 atmosphere of 500mm Hg were studied. The process of the reaction is composed of two steps, i.e. a phase boundary reaction followed by a subsequent diffusion process. The kinetic data can be expressed reasonably by the first-order equation for the earlier stage, and by Tamman's equation for the later one. The activation energy for the earlier stage of rutile is about 43Kcal/mol. There is a discontinuity at about 830°C in the plotting of log k against l/T for the earlier stage of anatase. The activation energies are about 34 and l6Kcal/mol above and below 830°C respectively. The activation energy for the later stage is about 34Kcal/mol for both anatase and rutile.

収録刊行物

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ