The thermal changes in gels of the SiO2-Al2O3-Sc2O3-H2O system.
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概要
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The DTA patterns of synthesized coprecipitated gels, the SiO<SUB>2</SUB>–Al<SUB>2</SUB>O<SUB>3</SUB>–Sc<SUB>2</SUB>O<SUB>3</SUB>–H<SUB>2</SUB>O system, resembled that of allophane as well as those of coprecipitated gels, the SiO<SUB>2</SUB>–Al<SUB>2</SUB>O<SUB>3</SUB>–M<SUB>2</SUB>O<SUB>3</SUB>–H<SUB>2</SUB>O system (M: Fe, Ga, or In). The exothermic reaction around 980 °C in the DTA was confirmed to arise from the formation of mullite. The scandium-rich coprecipitated gels showed a new small exothermic peak at about 1000 °C, based on the formation of thortveitite in the DTA. The apparent activation energy for the mullite formation on the coprecipitated gels decreased with an increase in the scandium content. A large portion of the scandium in the coprecipitated gels was deposited as the thortveitite by heating, while that in the mixed gels was deposited as the scandium oxide. The behavior of such trivalent cations as gallium, iron(III), indium, and scandium in the silicoalumina gels was discussed.
- 公益社団法人 日本化学会の論文
著者
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Hamada Shuichi
Department Of Applied Chemistry Faculty Of Science And Institute Of Colloid And Surface Chemistry Sc
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Kasai Mitsuhiro
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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