Abstract
Glass structure comprising (0–20) mol% Al2O3–(20–40) mol % Ag2O-and 60 mol % P2O5 was examined using a 27Al, 31P MAS- NMR and FTIR spectroscopy. The structural changes within the complicated ternary phosphate glasses were correlated with that of a simple binary silver phosphate. Results show that aluminum acts primarily as intermediate ions, while silver acts as a potent modifier. The number of non-bridging oxygen atoms (NBO) on average in the structure of silver aluminophosphate (SAP) glasses decreases with increasing Al2O3 content. The aluminum ions in the SAP glass system occur in the coordinations of both Al (6) and Al (4). The Al (6) fraction rises with rising concentration of Al2O3. Al (6) is more than Al (4) in the glass containing more Al2O3 than that of 20 mol of Al2O3. The glass was transformed into a glass-ceramics by the effect of thermal heat treatment at 600 °C for 4 h.
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