Abstract
Amorphous glasses in the system xCdO-(100-x)(yNa2O + zP2O5), (x = 0, 10, 20, 30, 40, 42.5, 45, y = z) mol% are prepared by a fast quenching technique. Addition of CdO at the expense of equal amounts of both P2O5 and Na2O causes a substantial influence on the distinctive feature of the measured Raman spectra. The concentration of nonbridging oxygen atoms (NBO) rises with increasing CdO content. The numerical data from the deconvolution of Raman spectra revealed that Q3 (branching group) and Q2 (metaphosphate group) decline while Q1 (pyrophosphate group or end group) increases. The rise in the number of NBO in terms of Q1 is supported by the change in molar volume, free volume, and packing density. This result is compatible with Raman and NMR spectroscopic observations. Increased CdO content causes a rise in the O/P ratio, which causes an increase in NBO in the glass network which lowers the glass’s hardness number.
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