Kinetics of the Formation and Transformation of Alkoxy-derived Calcium Metasilicate

Wollastonite(β-CaSiO3) was formed directly from the mixed powder prepared by simultaneous hydrolysis of calcium and silicon alkoxides. Crystallization isotherms were described by the Avrami equation ln(1−α)=−ktn with n=3 and the activation energy was determined as 284.5 kJ/mol. The kinetics of trans...

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Published inBulletin of the Chemical Society of Japan Vol. 52; no. 11; pp. 3277 - 3279
Main Authors Yamaguchi, Osamu, Kamata, Muneaki, Shimizu, Kiyoshi
Format Journal Article
LanguageEnglish
Published Tokyo The Chemical Society of Japan 01.01.1979
Chemical Society of Japan
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Summary:Wollastonite(β-CaSiO3) was formed directly from the mixed powder prepared by simultaneous hydrolysis of calcium and silicon alkoxides. Crystallization isotherms were described by the Avrami equation ln(1−α)=−ktn with n=3 and the activation energy was determined as 284.5 kJ/mol. The kinetics of transformation of β- into α-CaSiO3 was best interpreted by the contracting cube equation 1−(1−α)1⁄3=kt. The value of the activation energy was 983.2 kj/mol.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.52.3277