The chemical composition of mullite which was termed from 2SiO 2 3Al 2 O 3 xerogel by firing was examined by analytical TEM. Mullite formed at 950°C firing showed around 66 mol% Al 2 O 3 , which was fairly Al 2 O 3 rich compared with the bulk composition. The chemical composition of mullite gradually approached the bulk composition as the firing temperature increased to 1400°C and slightly departed again above that firing temperature.
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Okada et al. (1987) studied this question.
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