Abstract
Four glass compositions of the system BaO-Al2O3-SiO2 with high content of BaO>50% mol and with B2O3 addition (3–10wt%) were melted at 1400°C. The effect of alkaline earth BaO oxide on the glass phase separation and on refraction index n is investigated. IR and MAS-NMR spectroscopy are used for structural characterization. Finally stable alkaline free glasses with a content of BaO ranging from 47.4Mol.% to 54.5Mol.% and with a n=1.62±0.01at 468.1nm have been obtained.
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