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29Si and 27Al MAS NMR study of the thermal transformations of kaolinite from North China

Published online by Cambridge University Press:  09 July 2018

H. P. He ,
J . G. Guo ,
J . X. Zhu  and
C. Hu
H. P. He*
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou510640
J . G. Guo
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou510640
J . X. Zhu
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou510640
C. Hu
Affiliation:
National Laboratory of Solid State Microstructural Physics, Nanjing University, Nanjing 210093, China
*
*E-mail: hehp@gig.ac.cn
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Abstract

The thermal transformations of kaolinite have been studied using 27Al and 29Si magic angle spinning nuclear magnetic resonance (MAS NMR), X-ray diffraction (XRD), differential thermal analysis (DTA) and thermogravimetric analysis (TG). The experimental results show that this sample is a pure kaolinite which contains ∼3% carbonaceous material as impurity. 27Al and 29Si MAS NMR spectra show that the microstructural evolution of the thermal transformation of kaolinite at 450 –1050ºC is similar to that of the kaolinite– mullite reaction series previously published by many authors. 29Si MAS NMR spectra of mullite at 1190 and 1250ºC display two resonances at ∼ – 87 and –92 ppm, corresponding to sillimanite-type geometry around Si and the typical Si environment of mullite, respectively. At 1350ºC, the splitting of (hk0) and (kh0) of mullite occurs, indicating that the primary mullite transforms into orthorhombic mullite. Simultaneously, the resonance at ∼ – 92 ppm splits into two signals at ∼ –90 and –94 ppm. 27Al MAS NMR spectra of the mullite consist of three signals centred at ∼ –4, 45 and 60 ppm, corresponding to octahedral, distorted tetrahedral and tetrahedral Al sites, respectively.

Keywords

kaolinitemullitethermal transformation27Al and 29Si MAS NMRChina
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 4 , December 2003 , pp. 551 - 559
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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