ABSTRACT
The molecular scale of mixing usually occurs after dissolution of two aluminum- and silicon-based salts in a suitable solvent and their homogeneous mixing. Departure of the last of the protonic species enhances catastrophic changes in the noncrystalline polymeric network. How the 980 C exothermic peak is exhibited and how the last of the protons are eliminated are discussed prior to discussions regarding the various routes of mullite formation. The rate of condensation of silanol groups increases with an increase of pH. The use of ammonia enhances the growth of aluminum hydroxide, which ultimately leads to crystallization. tetraethyl orthosilicate is used for the synthesis of mullite gels, and thus the gel chemistry largely depends on its hydrolysis and later on its condensation behavior. However, the configuration of the noncrystalline aluminosilicate precursor phase obtained during the heating process of mullite Powder C synthesized by Jaymes et al. would be nearly similar to that in the mullite lattice stage.
