| ^29Si,^27Al Magic—Angle—Spinning Nuclear Magnetic Resonance（MAS NMR） Studies of Kaolinite and Its Thermal Transformation Products |
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| 摘 要： |
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| 关 键 词： | 高岭石 多铝红柱石 硅石 氧化铝 硅铝尖晶石 交角自旋核磁共振谱学 热交换产物 |
29Si,27Al magic-angle-spinning nuclear magnetic resonance (MAS NMR) studies of kaolinite and its thermal transformation products |
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| Authors: | He Hongping Hu Cheng Guo Jiugao Zhang Huifen |
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| Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou;(2) National Laboratory of Solid State Microstructural Physics, Nanjing University, 210008 Nanjing |
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| Abstract: | 27Al,29Si MAS NMR studies of kaolinite and its thermal transformation products show that in the kaolinite-mullite reaction series
there is an extensive segregation of Al2O3 and SiO2 and the reaction of Al2O3 with SiO2 to form mullite is the main path of mullite formation. At about 850° C, the peak intensity of A1(V) reaches its maximum and
with the further rise of temperature the A1(V) signal completely disappears. At about 950°C, γ-Al2O3 accounts for about 71% of the material phases containing Al atoms. In the series there is no obvious presence of Al-Si spinel.
The27Al and29Si MAS NMR spectra show that there is an obvious difference between the temperature points for Al-O2(OH)4 octahedral sheet collapsing and Si-O4 tetrahedral sheet breaking down. |
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| Keywords: | kaolinite mullite silica γ -Al2O3 Al-Si spinel MAS NMR spectrum |
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