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The structure of mold flux glasses in the system CaO‐(Na,Li)2O‐SiO2‐CaF2 with unusually high modifier contents, stabilized by the addition of ∼4 mol% B2O3, is studied using 7Li, 23Na, 19F, 11B, and 29Si magic‐angle‐spinning (MAS), and 7Li{19F} and 23Na{19F} rotational echo double‐resonance (REDOR) nuclear magnetic resonance (NMR) spectroscopy. When taken together, the spectroscopic results indicate...
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