STUDY OF THE STRUCTURE OF MIXED LEAD BOROPHOPSHATE GLASSES BY NMR, RAMAN AND IR SPECTROSCOPY

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Mixed potassium-lead borophosphate glasses were studied in two compositional series xK₂O-(50-x)Pb0-10B₂O₃-40P₂O₅ and xK₂O-(50-x)PbO-20B₂O₃-30P₂O₅ with x = 0, 10, 20, 30, 40 and 50 mol% K₂O. The replacement of lead by potassium results in remarkable changes of the ¹¹B and ³¹P MAS NMR, Raman and infrared spectra of these glasses. The observed changes in the spectra and properties of the glasses can be ascribed mainly to the differences in the space occupied by cations, the differences in electronegativity and the field strength of the corresponding cations.