Viscosity of Na–Si–O–N–F Melts: Mixing Effect of Oxygen, Nitrogen, and Fluorine

Structural Analysis Methods for Characterizing Multicomponent Melts and Glasses Processed at High Temperatures

“…These results were attributed to dopant (e.g., N and F)-induced changes in the silicate network, and the influences of these elements on the oxide viscosities were discussed based on corresponding NBO/T ratios. 17) Although melt or glass viscosities are important fundamental parameters for vitrifying highly radioactive liquid wastes at high temperatures, multicomponent-oxide viscosities depend on many factors. 25) Radioactive raw materials (e.g., liquid wastes and glasses) are fed from the top of the furnace, and melts are poured from the bottom of the furnace and injected into a canister.…”

“…[81][82][83] Alkali-and alkaline-earth-oxide-containing CaO-SiO 2 -Al 2 O 3 glass structures have previously been systematically investigated using multinuclear 27 Al and 29 Si MAS NMR spectroscopies and CaO-SiO 29 Si MAS NMR spectra provide important information about the polymerization of silicate anions in Na-Si-O-N-F glasses. 17) Although the influences of both the N and F contents on the glass structure were investigated, NaF was detected as a precipitate in solidified glasses. Figure 10 shows the 29 Si MAS NMR spectra measured at 11.7 T for Na-Si-O-N-F glasses and corresponding Gaussian-fitted simulation curves.…”

“…Figure 10 shows the 29 Si MAS NMR spectra measured at 11.7 T for Na-Si-O-N-F glasses and corresponding Gaussian-fitted simulation curves. 17) The solid-black, broken-blue, and red lines represent the experimentally measured spectra, fitted Q n -component curves, and fitted-curve summation, respectively. The spectrum of the NS2 glass revealed a main peak, indicating that the Q 3 species was the major siliconatom component in the NS2 glass.…”

“…[9][10][11][12] Therefore, physical properties such as the viscosity and surface tension of the relevant oxides have previously been investigated using various methods. [13][14][15][16][17][18][19][20][21][22][23] However, because of errors in experimental data collected under different conditions at different laboratories, systematic experiments must be conducted. 9) To measure physical properties and elucidate reaction mechanisms, structures have previously been analyzed using methods such as Raman spectroscopy and 29 Si magic-angle-spinning magnetic resonance spectroscopy (MAS NMR), which are powerful for detecting SiO 2 -network polymerization and depolymerization in melts and glasses.…”

Influence of Fluorine and CaO/Al2O3 Ratio on the Wetting Behavior Between CaO–Al2O3‐Based Mold Flux and Steel Substrate

“…), and free F (F-, etc). [22,23] It is more likely to be non-bridging F and free F with its continuous addition. So, the continuous addition of F leads to a simpler and looser melt structure, and then decreases the contact angle.…”