Properties and structure of (50-x)BaO-xZnO-50P2O5 glasses

The thermal, mechanical, chemical properties and the structure of (50 - x)BaO-xZnO-50P(2)O(5) (0 <= x <= 50 mol%) glasses were investigated. For these glasses, the density (p), glass transition temperature (T,), dissolution rate (DR) P-31 magic angle spinning nuclear magnetic resonance (MAS-NMR) spectra and Fourier-transformed infrared (FTIR) spectra were determined. As BaO was replaced by ZnO, all the properties were similarly decreased in density, Young's modulus, T-g and water resistance. FTIR analyses revealed a shortening of phosphate chains by the shift of (P-O-P)(as) band to a higher wave number owing to the substitution ZnO of BaO. The NMR spectra showed that the replacement of BaO by ZnO decreased the concentration of Q(2)-tetrahedral sites and increased that of Q(1)-tetrahedral sites. (c) 2005 Elsevier B.V. All rights reserved.