Structural Studies on xPbO: (100-x)P<sub>2</sub>O<sub>5</sub> Glasses

Mohamed Ibrahim Abdelghany; Gomaa El-Damrawi; Mahrous Shaker Meikhail; Fawzia Zaid

doi:7260223

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 Q^o units which enriched with (NBO).

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