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- W2004681431 abstract "The kaolinite−mullite reaction process has been studied by single- and triple-quantum 27Al magic-angle spinning (MAS) NMR. All materials have also been characterized by 29Si MAS NMR and powder X-ray diffraction. It has been shown that in order to record reliable 27Al MAS NMR spectra it is important to use very fast sample spinning rates (which at 9.4 T are in excess of 30 kHz). The conflicting values previously reported in the literature for the four-, five- and six-coordinated Al metakaolinite populations are, at least in part, due to the relatively modest and different MAS rates and magnetic fields used by the authors. Triple-quantum 27Al MAS NMR provides hard evidence for the presence in metakolinite of distorted (and distributed) four-, five-, and six-coordinated Al local environments. It also suggests that kaolinite calcined at 950 °C is a mixture of amorphous material, poorly crystalline mullite, and γ-alumina and a small amount of unreacted metakaolinite." @default.
- W2004681431 created "2016-06-24" @default.
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- W2004681431 date "1999-10-07" @default.
- W2004681431 modified "2023-10-14" @default.
- W2004681431 title "Single- and Triple-Quantum <sup>27</sup>Al MAS NMR Study of the Thermal Transformation of Kaolinite" @default.
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- W2004681431 doi "https://doi.org/10.1021/jp991516b" @default.
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