Synthesis of calcium silicate by a chelate gel route with aqueous solution of citric acid

H. Fujimori, D. Yahata, N. Yamaguchi, D. Ikeda, Koji Ioku, S. Goto

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Recently, novel gel techniques such as the metal-chelate gel method, in situ polymerized complex method and polymer precursor method have been utilized to prepare many kinds of ceramics. These techniques offer the potential advantage of achieving compositionally homogeneous and fine powders with a narrow size distribution. Since the hydration activity of calcium silicates is affected by phase changes and the surface area, it is of vital importance to take into account both polymorphic forms and particle size. In this study, a metal-chelate gel route based on gelation of the aqueous solution of citric acid has been successfully applied to the synthesis of calcium silicates (Ca2SiO4 and Ca3SiO5) for the first time. In addition, their phase transformations and particle size are discussed in comparison to the conventional solid-state reaction route. The novel citrate gel route and the conventional solid-state reaction route were found to produce β-Ca2SiO4 (high-temperature phase) and γ-Ca2SiO4 (low-temperature phase), respectively. This result can be explained in terms of the particle size effect and the energy barrier. The nucleation and propagation of microcracks were responsible for overcoming a comparatively high-energy barrier, ΔGβ→γ *. The particle size effect governs both the statistic of martensitic nucleation and the propagation of the β→γ transformation. In contrast to Ca2SiO4, triclinic Ca3SiO5 (low-temperature phase) was obtained by both the citrate gel route and the conventional solid-state reaction route. The nucleation and propagation are not responsible for the transformation, thus the energy barrier of the monoclinic (M) to the triclinic (T) transformation, ΔGM-T *, are considered to be small.

Original languageEnglish
Pages (from-to)391-395
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume109
Issue number1269
Publication statusPublished - 2001 May
Externally publishedYes

Fingerprint

calcium silicates
Calcium silicate
citric acid
Citric acid
chelates
Citric Acid
Gels
routes
gels
aqueous solutions
Energy barriers
Solid state reactions
Particle size
synthesis
Nucleation
nucleation
citrates
solid state
propagation
Metals

Keywords

  • Calcium silicate
  • Energy barrier
  • Particle size effect
  • Phase stability
  • Sol-gel

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Synthesis of calcium silicate by a chelate gel route with aqueous solution of citric acid. / Fujimori, H.; Yahata, D.; Yamaguchi, N.; Ikeda, D.; Ioku, Koji; Goto, S.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 109, No. 1269, 05.2001, p. 391-395.

Research output: Contribution to journalArticle

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