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The environment of the Al atom in alumina gels, single‐phase and diphasic mullite gels, and their transformation products was studied by 27 Al magic‐angle spinning nuclear magnetic resonance (MASNMR). Alumina gels made from inorganic and organic precursors showed exactly the same 27 Al MASNMR spectra. Heat treatment of gels at 500°C caused artial conversion of octahedral Al to tetrahedral Al. The Al in single‐phase mullite gel appears to be highly ordered compared to that in diphasic mullite gel.
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Komarneni et al. (1985) studied this question.
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