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- A. Glasses (1) (entfernen)
Potassiumzinc borophosphate glasses were prepared and studied in two compositional series xK2O(50x)ZnO10B2O340P2O5 and
xK2O(50x)ZnO20B2O330P2O5 with x = 0, 10, 20, 30, 40 and 50 mol% K2O. The replacement of zinc by potassium decreases the
density and increases the molar volume of these glasses, whereas glass transition temperature and chemical durability decrease with
increasing potassium content. Structural changes were studied by 11B and 31P MAS NMR and Raman spectroscopy. The observed
changes in the spectra and the properties of the studied glasses can be ascribed to several reasons and namely to the differences in the
space occupied by cations Zn2+ and 2K+, the differences in the electronegativity of zinc and potassium and a large difference in the field
strength of Zn2+ and K+ cations and thus higher ionicity of KO bonds in comparison with ZnO bonds.