Activity of SiO2in {(1 −x)B2O3+xSiO2} determined by (slag + metal) equilibrium at the temperature 1723 K, using (0.25 Cu + 0.75 Sn) as metal solvent

Thermodynamic Properties of the MgO–BO1.5, CaO–BO1.5, SiO2–BO1.5, MgO–BO1.5–SiO2 and CaO–BO1.5–SiO2 Slag Systems at 1 873 K

“…Thermodynamic properties of the MgO-BO 1.5 , [3][4][5][6][7] CaO-BO 1.5 , [7][8][9][10][11][12] and SiO 2 -BO 1.5 [13][14][15][16][17][18] binary systems have been measured by various researchers at a wide but low temperature range between 1 273 K and 1 800 K. Several methods, such as chemical equilibration and Knudsen-cell mass spectrometry, were used. However, discrepancies exist in some of these over the investigated concentration and temperature range.…”

Thermodynamic Assessment of B₂O₃-SiO₂ Binary System

“…All of the thermodynamic data are considered in the present work. For the inconsistence of the activity data measured by Zhang [18] at 1773K and those at 1723 K by Wang [19], the activity data is assigned a low weight in the optimization. The interaction parameter A of L 0 (15,760) obtained from the present work is in accordance with that of Hervig and Narotsky [16] (12.95±0.96 kJ/mol).…”

“…Their data have indicated a positive deviation from the ideal behavior. Moreover, the results of Zhang [18] at 1773K and those of Wang [19] at 1723K did not consistent well with each other. Furthermore, the activity of B 2 O 3 obtained by Shul'ts [20] showed negative deviation from the ideal behaviour.…”

“…Boike [17] measured the activity of B 2 O 3 as a function of composition (from 20 to 90 mol % B 2 O 3 ) by Knudsen effusion mass spectrometry from 1450 to 1500K. Activities of SiO 2 at 1773 and 1823K measured by Zhang [18] and those at 1723 K by Wang [19] were obtained by slag and metal equilibrium method. Their data have indicated a positive deviation from the ideal behavior.…”