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A Monte Carlo method was developed to determine the distribution of Al and Si cations from  29 Si MAS NMR data for framework aluminosilicates. The method was used to analyze data obtained from Cs-exchanged leucite in its high-temperature cubic phase and from cubic analcime samples. It was also used to determine the number of Al-O-Al linkages in cordierite for different degrees of Al-Si order. The results for cordierite were correlated with the calorimetric data of Carpenter et al. (1983) to estimate the energy for the reaction (Al-O-Al) + (Si-O-Si) → 2(Al-O-Si) of ~40 kJ/mol.

The use of Monte Carlo methods to determine the distribution of Al and Si cations in framework aluminosilicates from 29 Si MAS NMR data