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| - Structural Characterization of Glass from the Inversion of 23Na and 27Al 3Q-MAS NMRSpectra
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| - A spectrum-inversion approach to extract information from MQ-MAS NMR spectra in glasses is presented.This allows the reconstruction of the underlying two-dimensional distribution of the isotropic chemical shiftcorrelated to the quadrupolar interaction. The dependency upon the quadrupolar interaction and the RF fieldstrength of coherence transfers involved in the MQ-MAS experiment are taken into account in the presentapproach. The performance of the inversion procedure is examined. Thereafter, we attempt to correlate thedistributions of each interaction to structural local information. Two complex glasses (a borosilicate and abasaltic-like glass) have been studied using 17Al and 23Na 3Q-MAS NMR. These two nuclei allowed us toinvestigate their local environment. The interpretation of the different site distributions is discussed in termsof topological disorder, i.e., the distribution of specific geometrical parameters such as bond distances andangles. Using the semiempirical relationships previously established with crystalline silicate compounds, thedistributions of the Na−O distance and the Al−O−Si bond angle have been determined from the extracteddistributions of the isotropic chemical shift. The limits of the interpretation of quadrupolar interactiondistributions are also discussed.
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