الفهرس 
AcknowledgementsOnly 14 pages are availabe for public view
 |  | from | 163 |  |  |
| | | from | 163 | | |
Abstract
This study presents structural evaluation for new type of silver-phosphate glasses which were either amorphous or partially crystallized. Controlled crystallization process is applied to transform the glass to glass ceramics. The results have indicated that there is a clear difference in mechanism of changing of material structure, depending on whether the glass was amorphous or contained crystalline phases. Based on the data extracted from XRD, electron diffraction pattern(EDP) and NMR spectroscopy, glasses contain ≤ 55 mol% Ag2O are initially amorphous and contain relatively intermediate amounts of depolymerized (Qn) phosphate units. Glasses in ternary system of composition: x Al2O3-(40-x)Ag2O-60P2O5 is also studied to shed some light on structure role of aluminum in phosphate network. Al2O3 is added at the expense of Ag2O for the development of low-Tg and to help in stabilizing the phosphate glass structure.