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The short-range structure and network speciation have been studied in a series of beryllium boroaluminate glasses using 11 B, 27 Al and 9 Be NMR spectroscopy. All glasses are characterized by a coexistence of BeO 4 , BO 3 , BO 4 , AlO 4 , AlO 5 and AlO 6 species. The concentrations of BO 3 , AlO 5 and AlO 6...
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