Multinuclear MAS-NMR studies of Al2O3B2O3P2O5 glasses

The medium range structure of sodium silicate glasses: a molecular dynamics simulation

“…In the simulated glasses, Q 4 decreases and both Q 1 and Q 2 increase monotonically with increasing sodium oxide content, while Q 3 shows a maximum at around 30 mol% sodium oxide composition. The trends in the Q n changes with composition agree well with experiments; in particular, a maximum in Q 3 , which was observed in both NMR and Raman studies in sodium silicate glasses [17][18][19]53], was reproduced in the simulations (see Fig. 6).…”

“…Random distributions were calculated based on statistics proposed by Lacy [53]. Instead of suggesting an ordered binary model, the Q n distribution of modeled sodium silicate glasses shows a distribution closer to a random distribution, in agreement with more recent NMR studies [16][17][18]53]. In the simulated glasses, Q 4 decreases and both Q 1 and Q 2 increase monotonically with increasing sodium oxide content, while Q 3 shows a maximum at around 30 mol% sodium oxide composition.…”

“…On the other hand, Q n , (tetrahedra with n bridging oxygen (BO)), distributions were studied by solid state nuclear magnetic resonance (NMR) [15][16][17][18]. Early NMR studies suggested a binary model of Q n species [15], while more recent studies with higher signal-to-noise ratio supported a distribution with more Q n species [17,18]. The types of modifiers and the fictive temperature were also found to have a pronounced effect on Q n distributions [16].…”

Connectivity of Q-species in binary sodium-silicate glasses

“…Raman [4] and 29 Si MAS NMR [5][6][7][8][9] spectroscopy. In addition, theoretical approaches, like molecular dynamics (MD) method or thermodynamic modelling [10][11][12] offer alternative approaches giving glass structure expressed in terms of Q-units.…”

Deep filtration of molten aluminum using ceramic foam filters and ceramic particles with active coatings

“…Zhou et al [12] examined the corrosion resistance of an enamel coating with a high B 2 O 3 -P 2 O 5 content to molten aluminum. B 2 O 3 and P 2 O 5 form a kind of BPO 4 [13,14,15] network structure, and the conversion of the boron crystalline structure from trigonal to tetrahedral can increase the METALLURGICAL …”