The kaolinite-mullite reaction series in single crystal kaolinite has been characterized by transmission electron microscopy. The exotherm observed at 980° C is attributed to the formation of a spinel phase. Mullite crystallites have also been observed with the spinel phase and both phases have a composition near that of 3∶2 mullite. Subsequent heat treatment leads to the growth of mullite crystallites on the original kaolinite plates with the c-axis perpendicular to the plate.
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Srikrishna, K., Thomas, G., Martinez, R. et al. Kaolinite-mullite reaction series: a TEM study. J Mater Sci 25, 607–612 (1990). https://doi.org/10.1007/BF00714083
- Electron Microscopy
- Transmission Electron Microscopy
- Heat Treatment