International Journal of Modern Physics and Applications
Articles Information
International Journal of Modern Physics and Applications, Vol.6, No.1, Mar. 2020, Pub. Date: Mar. 9, 2020
Structural Characterization of Lithium Aluminum Borate Glasses
Pages: 9-12 Views: 242 Downloads: 110
Authors
[01] Gomaa El Damrawi, Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
[02] Rawya Ramadan, Microwave Physics and Dielectrics Department, Physics Research Division, National Research Centre, Dokki, Cairo, Egypt.
[03] Asmaa Barakah, Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Abstract
Glasses in the xLi2O (40-x)Al2O3.60B2O3 system (0≤x≤ 40) have been prepared by melt quenching technique. 27Al NMR measurements are applied to determine the structure role of Al2O3 in a wide range of composition. A great difference in the structure of the studied glasses is revealed by changing Li2O to Al2O3 molar ratios. The AlO6, AlO5 and AlO4 structured groups are the major units of pure Al2O3. On the other side, AlO4 and AlO5 are the main units in the binary Al2O3-B2O3 glass (Li2O=0 and 40 mol% Al2O3). Increasing Li2O/Al2O3 molar ratio results in the decreasing AlO5 concentration. In addition, AlO4 is considered the dominant species. Further increase in Li2O concentration results in formation of non-bridging oxygen atoms (NBOs) in AlO4 groups. Glasses of the high Li2O/Al2O3 ratio have an amorphous structure. More ordered crystalline phases are considered in glasses of a high Al2O3 concentration. The difference in the cation field strength (CFS) between Al3+, B3+ and Li+ cations was observed to affect the generation of AlO5, AlO6 and BO4 units.
Keywords
Borate Glasses, NMR Investigation, Coordination Number, Crystallized Phases
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