Abstract
In the present work, two sets of glass compositions: (79.5-x) B2O3 + x P2O5 + 10 Na2O + 10 PbO + 0.5AgO and 54.5 B2O3 + (25-x) P2O5 + (10+x) Na2O + 10 PbO + 0.5AgO (x = 0, 5, 10, 15, 20, 25 mol%), were prepared and investigated by means of their density, molar volume, UV-Vis optical absorption, IR absorption and Raman spectroscopic methods. Both density and molar volume properties with x mol% of P2O5 and Na2O in glasses were discussed. The effects of P2O5, B2O3 and Na2O in the optical energy gap (Eopt) are also presented and discussed. In Raman analysis, an increase of P2O5 resulted in a clear conversion of B Ø3 to B Ø4 units with four non-bridging oxygens bonded to phosphate groups (POB linkages, pyro- and ortho-phosphates) identified in all the spectra. With increasing Na2O, the metaphosphate network gets extensively depolymerized, resulting in the conversion of Q1 to Q° structural units. In IR absorption analysis, the addition of P2O5 at the expense of B2O3 resulted in the decrease of BO bonds with enhancements of P-O- and P=O bonds in PO2- groups. An increase of Na2O at the expense of P2O5, evinced a tendency of B Ø4 tetrahedra/BØ3 trigonal to create diborate/pyroborate groups to accommodate excess amount of Na cations into the BO network.
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