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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 36  1977
A Review on the Kaolinite-Mullite Transformation
s. P. CHAUDHURI
Pages : 71-78
DOI : 10.1080/0371750X.1977.10840646
Abstract
The transformation of kaolinite to mullite is reviewed. The thermal effects observed during the transformation and the phases which accompany these effects are discussed in the light of the existing concepts. The chemical, thermal, X-ray, electron-optical, infrared, orientational and crystallographic evidences are advanced to reveal the nature of the intermediate phases and to establish the course of the transformation reaction. Strong evidences exist in favour of AI-Si spinel and y-Al20 3 as the precursor of mullite formation. The formation of y-Al20 3 phase finds support in the recent ir, r.e.d. and X-ray fluorescence studies whereas the formation of AI-Si spinel phase is necessary to maintain the structural continuity of the phases from kaolinite to mullite as shown by the single crystal X-ray studies. The transformation follows the sequence:
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