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Structural Studies on xPbO: (100-x)P2O5 Glasses
Current Issue
Volume 7, 2020
Issue 1 (February)
Pages: 1-6   |   Vol. 7, No. 1, February 2020   |   Follow on         
Paper in PDF Downloads: 28   Since Sep. 27, 2020 Views: 677   Since Sep. 27, 2020
Mohamed Ibrahim Abdelghany, Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Gomaa El-Damrawi, Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Mahrous Shaker Meikhail, Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Fawzia Zaid, Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
Bulk binary PbO-P2O5 glasses with 40 to70 mol% PbO are prepared via a normal quenching method. The local structure around the phosphate ions was studied through NMR spectroscopy of 31P nuclei. The formation of distinguished types of Qn species of glasses of PbO (50 mol%) is in a good agreement with the data extracted from the simple model of binary silver and alkali phosphate glasses. Two-bridged oxygen atoms (BO) per each Q2 (phosphorus atom containing two BO) phosphate unit are the main species in glasses of less than 55 mol% PbO. Moreover, some phosphate units containing Q3 species are also evidenced to be formed. Higher concentration of PbO results in the development of phosphate groups with the more resolved resonance peak represents the Q1 structural units of the pyrophosphate composition. Deshielding of phosphate units by PbO was interpreted on bases of more separated membered rings enriched with Q1. Such features have also been confirmed by the result based on (FT-IR) vibrational spectroscopy. X-ray diffraction spectra (XRD) and electron diffraction patterns (EDP) of glasses of less than 55 mol% PbO have revealed an amorphous phosphate network. At higher concentrations of PbO, the more ordered and well crystallized phases are formed. Increasing non-bridging oxygen atoms (NBO) has a major impact on enhancements of crystallization in the high modifier glasses. The main reason for the development of a crystalline Pb3(PO4)2 phosphate phase is the formation of both ortho and pyrophosphate species that typically contain the highest concentration of isolated Q1 and Qo units which enriched with (NBO).
Lead Oxide, NMR Spectroscopy, Chemical Shift, Surface Morphology
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