Local structure of zinc ultraphosphate glasses containing large amount of hydroxyl groups: 31P and 1H solid state nuclear magnetic resonance investigation

Glass-forming ability and structure of ZnO–MoO3–P2O5 glasses

“…Zinc phosphate glasses xZnO-(100−x)P 2 O 5 were investigated in several papers [16][17][18][19][20][21]. Glass-forming region in this system is relatively broad depending on the cooling rate of the melt.…”

“…By slow cooling of the melt xZnO-(100−x)P 2 O 5 glasses can be obtained with x=0-60 mol% ZnO [16], whereas fast quenching enables obtaining glasses with x=60-80 [17]. Structure of zinc ultraphosphate glasses was studied by Raman and infrared spectroscopy by K. Meyer [18] and by 31 P MAS NMR spectroscopy by Mercier et al [19]. Structure of zinc polyphosphate glasses was studied by Walter et al [20] using diffraction methods and 31 P NMR.…”

High-speed 1H MAS NMR investigations of the weathered surface of a phosphate glass

“…Examples for phosphate glasses are more limited. Previous NMR investigations of hydroxyl concentration and dissolution surfaces in phosphate glasses include one-dimensional (1D) 1 H magic angle spinning (MAS) NMR investigations of hydroxyl groups in lead and barium phosphate glasses [18], hydroxyl content in erbium-doped aluminophosphate glasses [19], gel-derived phosphosilicate glasses [20], 31 P MAS NMR studies of sodium phosphate glass depolymerized by residual H 2 O [21], 31 P MAS NMR studies of hydrogelation of calcium metaphosphate glasses [22], and 1 H and 31 P MAS NMR along with 1 H-31 P crosspolarization (CP) MAS NMR investigations of hydroxyl concentration and dissolution surfaces in zinc ultraphosphate glasses [23,24]. In glasses utilizing 1 H and 31 P MAS NMR, along with 2D 1 H-31 P heteronuclear CPMAS correlation experiments, have shown that multiple proton and phosphorus sites could be resolved in these dissolution surfaces [25].…”

“…Static 1 H NMR experiments of glasses have revealed two proton environments based on differences in the 1 H-1 H dipolar couplings and corresponding line shapes. Moderate speed (between 10 and 15 kHz) 1 H MAS NMR has been utilized to determine the isotropic chemical shift of different 1 H species in these surfaces, and in general has been able to resolve between two and three different proton environments in dissolution/weathered surfaces of aluminosilicate [14][15][16] and phosphate glasses [18,[23][24][25]. The large homonuclear 1 H-1 H dipolar coupling (between 25 and 40 kHz) is not readily eliminated or averaged at these moderate spinning speeds, leading to broad, poorly resolved resonances, with numerous spinning sidebands during the analysis of glasses.…”

Solid state NMR study of phosphosilicate gels

“…Moreover these glasses contain a large amount of hydroxyl (OH) groups even when they are synthesized by melting [3,4].…”