Distribution of charges in aqueous alkaline solutions of boron(III), aluminum(III), gallium(III), and silicon(IV)

Structure of Aqueous Sodium Aluminate Solutions: A Solution X-ray Diffraction Study

“…In all other cases rmsd values were fixed, and set equal to an approximate value chosen from the literature. 32 (10) The "continuous" part of the structure function was omitted from the structural analysis, as it is irrelevant to the local order of current interest.…”

“…However, the chemical characterization of these solutions is difficult because they are chemically aggressive and, like all highly concentrated electrolyte solutions, hard to deal with both theoretically and experimentally. Indeed, many of the most powerful analytical techniques for studying chemical speciation in solution such as potentiometry − and NMR, − UV−Vis, − and IR/ Raman ,,− spectroscopies have had limited success in providing useful information about these solutions, as evidenced by a striking lack of agreement between them …”

“…1 However, the chemical characterization of these solutions is difficult because they are chemically aggressive and, like all highly concentrated electrolyte solutions, hard to deal with both theoretically and experimentally. Indeed, many of the most powerful analytical techniques for studying chemical speciation in solution such as potentiometry [2][3][4][5][6] and NMR, [7][8][9][10][11][12][13] UV-Vis, [12][13][14][15] and IR/ Raman 9,12,[16][17][18][19] spectroscopies have had limited success in providing useful information about these solutions, as evidenced by a striking lack of agreement between them. 20 Although some solution X-ray diffraction measurements were made as part of a much larger study of alkaline aluminate solutions in Hungary in the 1970s, 21 no structural conclusions were drawn and the data have not been published in the open literature.…”

Phase Equilibrium in the Ternary System K2O–Al2O3–H2O at 323.15, 333.15, 343.15, and 353.15 K

“…Qiu et al reported another new solid of 4Na 2 O·Al 2 O 3 ·12H 2 O. Considering the complexity of sodium aluminate solutions, many advanced analytical techniques including NMR, − UV–vis spectroscopy, and potentiometry , were employed in studying the physicochemical properties of the solution in order to provide useful information about the Na 2 O–Al 2 O 3 –H 2 O system . According to the research, it was found that the equilibrium solid phases of this ternary system diversified with temperature and concentration.…”

Phase Diagrams for the Ternary Na2O−Al2O3−H2O System at (150 and 180) °C

“…Qiu and Chen reported another new solid, 4Na 2 O·Al 2 O 3 ·12H 2 O, besides the crystalline phases mentioned above. Indeed, owing to the complexity of sodium aluminate solutions, many of the most powerful analytical techniques for investigating solution physicochemical properties such as potentiometry, , NMR, − and UV−vis spectroscopy have limited success in providing useful information about such systems, as evidenced by a striking lack of agreement between analytical results obtained using these methods . Thus, accurate identification of the solid phases in the Na 2 O−Al 2 O 3 −H 2 O system is the subject of considerable research effort.…”