Mechanisms of Incipient Chemical Reaction between Ca(OH)2and SiO2under Moderate Mechanical Stressing

Tomoyuki Watanabe; Tetsuhiko Isobe; Mamoru Senna

doi:10.1006/jssc.1997.7338

Mechanisms of Incipient Chemical Reaction between Ca(OH)₂and SiO₂under Moderate Mechanical Stressing

Tomoyuki Watanabe, Tetsuhiko Isobe, Mamoru Senna

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

The structure of mechanically induced precursor in an amorphous state between Ca(OH)₂and SiO₂was determined by solid state MAS and CP/MAS²⁹SiNMR spectroscopies, and the changes in the behavior of crystallization by linear heating were studied by X-ray diffractometry. A large broad Q₀peak due to the short-range order of hydrated calcium silicates appeared in the²⁹SiNMR spectra of mechanically induced precursors. The formation of the new ordering is confined in the near-surface region of SiO₂particles, as confirmed by comparing MAS and CP/MASNMR spectra. When the amorphous precursor obtained above was subsequently heated, a rapid solid state reaction led to single phasedα-CaSiO₃as the final product.

Original language	English
Pages (from-to)	284-289
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	130
Issue number	2
DOIs	https://doi.org/10.1006/jssc.1997.7338
Publication status	Published - 1997 May 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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abstract = "The structure of mechanically induced precursor in an amorphous state between Ca(OH)2and SiO2was determined by solid state MAS and CP/MAS29SiNMR spectroscopies, and the changes in the behavior of crystallization by linear heating were studied by X-ray diffractometry. A large broad Q0peak due to the short-range order of hydrated calcium silicates appeared in the29SiNMR spectra of mechanically induced precursors. The formation of the new ordering is confined in the near-surface region of SiO2particles, as confirmed by comparing MAS and CP/MASNMR spectra. When the amorphous precursor obtained above was subsequently heated, a rapid solid state reaction led to single phasedα-CaSiO3as the final product.",

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AU - Watanabe, Tomoyuki

AU - Isobe, Tetsuhiko

AU - Senna, Mamoru

PY - 1997/5/1

Y1 - 1997/5/1

N2 - The structure of mechanically induced precursor in an amorphous state between Ca(OH)2and SiO2was determined by solid state MAS and CP/MAS29SiNMR spectroscopies, and the changes in the behavior of crystallization by linear heating were studied by X-ray diffractometry. A large broad Q0peak due to the short-range order of hydrated calcium silicates appeared in the29SiNMR spectra of mechanically induced precursors. The formation of the new ordering is confined in the near-surface region of SiO2particles, as confirmed by comparing MAS and CP/MASNMR spectra. When the amorphous precursor obtained above was subsequently heated, a rapid solid state reaction led to single phasedα-CaSiO3as the final product.

AB - The structure of mechanically induced precursor in an amorphous state between Ca(OH)2and SiO2was determined by solid state MAS and CP/MAS29SiNMR spectroscopies, and the changes in the behavior of crystallization by linear heating were studied by X-ray diffractometry. A large broad Q0peak due to the short-range order of hydrated calcium silicates appeared in the29SiNMR spectra of mechanically induced precursors. The formation of the new ordering is confined in the near-surface region of SiO2particles, as confirmed by comparing MAS and CP/MASNMR spectra. When the amorphous precursor obtained above was subsequently heated, a rapid solid state reaction led to single phasedα-CaSiO3as the final product.

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Mechanisms of Incipient Chemical Reaction between Ca(OH)₂and SiO₂under Moderate Mechanical Stressing

Abstract

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