System Ag2O-B2O3; Its Thermodynamic Properties as A Slag Model

Borate Glass Structure

“…Therrnodynarnic data can often be used quite effectively in discussing the structures of molten salts and ceraITlic oxides (18,45,133). The inforITlation derived froITl such "phase diagraITl ITlethods " is not of the saITle precise nature as that flowing froITl the experiITlental techniques described in the preceding chapters; bond angles, bond lengths, and other geoITletric factors, for exaITlple, cannot be deterITlined.…”

“…A review of numerous types of defect centers in alkali borate glasses has been given (135). Also, recent work in the silver borate system (144) (18) and adds yet further support to Krogh-Moe's contention (45,57) that tetraborate groups are formed when silver or alkali oxide is added in amounts:::' 20 mol % to B203 melts.…”

Chemical equilibrium calculations for bulk silicate earth material at high temperatures

“…The regular solution model in Table 2 based on this point agrees well with the ideal solution model but the second model assuming Ag2O has the same activity coefficient as Cu2O gives temperatures about 140 -500 K lower than the other two models over the 10 -6 -10 2 bar range. Prior work on silver solubility in melts in the Ag2O -B2O3 -Na2O -Al2O3 system (Willis and Hennessy 1953, Maekawa et al 1969, Wakasugi et al 1997 shows negative deviations from ideality for Ag2O. The existence of Ag4SiO4 and other silver silicates (Klein and Jansen 2008) indicates negative deviations from ideality in the Ag2O -SiO2 system.…”