High-resolution 27Al–19F solid-state double resonance NMR studies of AlF3–BaF2–CaF2 glasses

Modern high-resolution nuclear magnetic resonance (NMR) spectroscopic techniques were applied to study the local environments of several aluminum fluoride-based glasses and the model crystalline compound AlF3. Through the combined application of magic-angle spinning (MAS), 27Al triple-quantum magic-angle spinning, as well as cross-polarization magic-angle spinning and rotational echo double resonance methods, a physical model concerning the short-range order has been developed for the glasses.