31P and 27Al nuclear magnetic resonance studies on silver phosphate glasses
Abstract
Phosphate glasses of mol% xAl2O3:(40-x)Ag2O:60P2O5 have been prepared and studied by different techniques. X-ray diffraction measurement (XRD) has indicated the amorphous nature of the glasses. The hardness of the glasses increases with increasing Al2O3 concentrations. Data based on 27Al, 31P MAS NMR and Fourier transform infrared (FTIR) spectroscopy has been presented. The structural changes within the ternary phosphate glasses were correlated with that of the simple binary silver phosphate glasses. The obtained data led to suggest that aluminum plays a dual role, i.e., acts primarily as intermediate ions which means that Al2O3 enters the network of the glass both as a modifier and glass former. But silver oxide acts as a strong glass modifier. The number of non-bridging oxygen bonds (NBO) on average in the phosphate network decreases with increasing Al content. The Al2O3 in the structure of glasses exists in both Al(6) and Al(4). The concentration of Al(6) increases with increasing Al2O3 content. The concentration of Al(4) is much lower than that of Al(6) in the glass of 20 mol % Al2O3.
About the Authors
G. El-Damrawi
Glass Research Group, Physics Department, Faculty of Science, Mansoura University
Egypt
Egypt
35516 Mansoura
A. K. Hassan
Glass Research Group, Physics Department, Faculty of Science, Mansoura University
Egypt
Egypt
35516 Mansoura
A. Shahboub
Glass Research Group, Physics Department, Faculty of Science, Mansoura University
Egypt
Egypt
35516 Mansoura
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Review
For citations:
El-Damrawi G., Hassan A.K., Shahboub A. 31P and 27Al nuclear magnetic resonance studies on silver phosphate glasses. Magnetic Resonance in Solids. 2018;20(2):18202 (7 pp.).
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