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29Si- and 27Al-MAS/NMR study of the thermal transformations of kaolinite

Published online by Cambridge University Press:  09 July 2018

T. Watanabe ,
H. Shimizu ,
K. Nagasawa ,
A. Masuda  and
H. Saito
T. Watanabe
Affiliation:
Laboratory of Chemistry, Tokyo University of Fisheries, Konan, Minato-Ku, Tokyo 108
H. Shimizu
Affiliation:
Department of Chemistry, Faculty of Science, The University of Tokyo, Hongo, Tokyo 113
K. Nagasawa
Affiliation:
Institute of Geosciences, Faculty of Science, Shizuoka University, Ohya, Shizuoka 422
A. Masuda
Affiliation:
Department of Chemistry, Faculty of Science, The University of Tokyo, Hongo, Tokyo 113
H. Saito
Affiliation:
Biophysics Division, National Cancer Center Research Institute, Tsukiji, Tokyo 104, Japan
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Abstract

Thermal transformations of kaolinite were studied by 29Si- and 27Al-MAS/NMR and ESR techniques. In metakaolin, Si is still dominantly in the Q3 state (three Si atoms bonded to an Si-O4 tetrahedron) and Al detectable by NMR is in both 4-coordination and 6-coordination. Coordination polyhedra around Al or Fe replacing Al are much distorted. Metakaolin crystallizes into γ-alumina and mullite exothermically at ∼980°C, this crystallization being preceded by a faint endothermic reaction. The latter is due to segregation of SiO2 and Al2O3, which results in an increase of Si in the Q4 state and an increase of 6-coordinated Al2O3.

Type
Research Article
Information
Clay Minerals , Volume 22 , Issue 1 , March 1987 , pp. 37 - 48
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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