Abstract
High-speed MAS gives a three-fold gain in resolution of the m↔ m−1 ( m= 3 2 and − 1 2 ) satellite transitions of I = 5 2 nuclei in polycrystalline samples compared with the conventional “central transition” spectroscopy. This is demonstrated using a standard high-field NMR spectrometer and samples of tieilite and mullite. Signals from four- and six-coordinated Al are separated completely, and rotational sidebands do not overlap. Different six- and four-coordinated Al species can be distinguished.
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