Spinel Phase Formation During the 980°C Exothermic Reaction in the Kaolinite‐to‐Mullite Reaction Series
- 1 November 1987
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 70 (11) , 837-842
- https://doi.org/10.1111/j.1151-2916.1987.tb05637.x
Abstract
With the use of differential thermal analysis, X‐ray diffraction, and transmission electron microscopic techniques, we showed that γ‐Al2O3 type spinel phase is solely responsible for the 980°C exotherm in the kaolinite‐to‐mullite reaction series. Transmission electron microscopic characterization indicated that the spinel formation is preceded by a phase separation in the amorphous dehydroxylated kaolinite matrix. Chemical analysis of the spinel phase by energy dispersive X‐ray spectroscopy revealed a nearly pure Al3O2 composition.Keywords
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