Abstract
RECENTLY, Brindley and Nakahira1 have expressed their belief in the existence of a defect silicon-spinel phase preceding the transformation into mullite of kaolinite. This view has also been endorsed by Steadman and Youell2. Brindley and Nakahira1 have obtained evidence that the spinel phase has a high degree of orientation with respect to the original kaolinite crystal. Oriented transformations of this type have been observed by Bernal et al. 3 and by Steadman and Youell2. It may be mentioned here that I also observed oriented transformation of kaolinite into mullite during its heat treatment, the (002) plane of kaolinite being converted into the (231) plane of mullite4. The aim of this communication is to present experimental evidence for the existence of disordered phases preceding the formation of mullite during the heat treatment of kaolinite.
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MITRA, G. Evidence of Lattice Defects preceding Oriented Transformations during the Heat Treatment of Kaolinite. Nature 182, 1794 (1958). https://doi.org/10.1038/1821794a0
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DOI: https://doi.org/10.1038/1821794a0
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