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Kaolinite-rich samples were selected for  27 Al and  29 Si MAS NMR study to explore the effect of Fe on their spectra and provide insight into the nature of Fe ordering in kaolinite. Initial characterization by Chemical analysis, TEM, X-ray diffraction, and magnetic mass susceptibility (x*) measurement was conducted to obtain five samples of high purity and with a range of Fe content. Secondary iron oxide and hydroxide phases were extracted using an HCl treatment. TEM study of the samples before and after treatment revealed the effective removal of secondary Fe phases and pristine kaolinite crystal habits.

Fe ordering in kaolinite: Insights from 29 Si and 27 Al MAS NMR spectroscopy