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

Abstract The thermal, mechanical, chemical properties and the structure of (50 − x )BaO– x ZnO–50P 2 O 5 (0 ⩽ x ⩽ 50 mol%) glasses were investigated. For these glasses, the density ( ρ ), glass transition temperature ( T g ), dissolution rate (DR), 31 P 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.