Abstract
The influence of mechanochemical treatment on the homogeneity of gibbsite–silicic acid mixtures was investigated by 29Si and 27Al MAS NMR, DTA–TG and XRD. Increased homogeneity of mullite precursors prepared by grinding mixtures of the appropriate stoichiometry for 20 h is indicated by the appearance of metakaolinite-like 4-coordinated Al resonances in the 27Al NMR spectra and new resonances at −93 and −101 ppm in the 29Si spectra. The influence of hydration water on the grinding reactions is also discussed.
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