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Glasses in the system 30P2O5-30B2O3-40Na2O-xTiO2 (0 ≤ x ≤ 25 mol %) have been prepared by the melt-quenching technique. Increasing the TiO2 content of the glass structure results in a decrease in the molar volume and an increase in the glass transition/softening temperatures. Structural changes were studied by Raman spectroscopy, and 11B and 31P solid-state NMR. The observed changes in the spectra...
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