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The Influence of Random Defect Density on the Thermal Stability of Kaolinites

He, Hongping, Yuan, Peng, Guo, Jiugao, Zhu, Jianxi, & Hu, Cheng (2005) The Influence of Random Defect Density on the Thermal Stability of Kaolinites. Journal of the American Ceramic Society, 88(4), pp. 1017-1019.

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Abstract

The thermal stability of kaolinite and the microstructure of its thermal products strongly depend on random defects (R2) rather than crystalline defects (HI). Kaolinite with lower random defect density is more stable than that with higher defect density during dehydroxylation and the derived metakaolinite can be directly transformed into orthorhombic mullite (3/2-mullite). However, for kaolinite with higher random defect density, there is a cubic phase occurring in the transformation from metakaolinite to primary mullite. Primary mullite will be transformed into orthorhombic mullite as temperature increases. AlV is universally present in the metakaolinite and the relative amounts of AlVI, AlV and AlIV vary with the random defect density of the parent kaolinite.

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4 citations in Scopus
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3 citations in Web of Science®

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ID Code: 1549
Item Type: Journal Article
Keywords: kaolinite, MAS NMR, defect, mullite, thermal stability, XRD, TG
DOI: 10.1111/j.1551-2916.2005.00194.x
ISSN: 1551-2916
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 Blackwell Publishing
Copyright Statement: The definitive version is available at www.blackwell-synergy.com
Deposited On: 11 Jul 2006
Last Modified: 11 Aug 2011 04:39

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