Chemistry-crystallization relations in molecular mullite gels

Jeffrey C. Huling, Gary L. Messing

Research output: Contribution to journalArticle

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Abstract

Sol-gel chemistry profoundly affects the crystallization of molecular aluminosilicate gels. Segregation of transition alumina-yielding species during gel synthesis results in the epitaxial nucleation of spinel at 980°C. When synthesis conditions leading to alumina segregation are avoided, t-mullite crystallizes at 980°C. However, it is shown, for the first time, that these gels are phase-separated prior to crystallization by a hydrothermal reaction known as dealumination. When the molecular gels are synthesized and heated to avoid this mechanism of phase separation, the gels crystallize directly to o-mullite at 700°C. This crystallization temperature for o-mullite in aluminosilicate gels is ∼ 500°C lower than those previously reported.

Original languageEnglish (US)
Pages (from-to)213-221
Number of pages9
JournalJournal of Non-Crystalline Solids
Volume147-148
Issue numberC
DOIs
StatePublished - 1992

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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