Mass spectrometric investigation of the vaporization and thermodynamic properties of components in the BaO-SiO2 system

Abstract

The vapor composition and thermodynamic properties of components in the BaO-SiO 2 system at a temperature of 1970 K are determined using high-temperature mass spectrometry. The thermodynamic properties of melts in the BaO-SiO 2 system are calculated within the framework of the vacancy variant of the generalized lattice theory of associated solutions. This made it possible to establish the relation between the thermodynamic properties and the structural features of melts in the BaO-SiO 2 system.

Thermochemical Aspects of Boron and Phosphorus Distribution Between Silicon and BaO-SiO2 and CaO-BaO-SiO2 lags

“…Regarding the low measured equilibrium concentrations of Ba in silicon, we have a dilute solution of Ba in Si and it is a fair approximation to assume ideal behavior for silicon solvent; a Si equal to unity. The chemical activities in BaO-SiO 2 solutions has been studied in literature through experimental and theoretical works [22][23][24][25]. Based on the measured activities for BaO and SiO 2 by Tyurnina et al [23,24] at 1910 K (1637 • C), the chemical activities of these slag components were calculated by a regular solution approximation at 1773 K (1500 • C) and 1873 K (1600 • C).…”

Thermodynamic properties of melts in the SrO-SiO2 system from data of the generalized lattice theory of associated solutions

“…For melts in the SrO-SiO 2 system, with due regard for the results obtained in [4,5], we accepted the following structural model: [SrO] and [SiO 4/2 ] were chosen as probable elements of the structure within the framework of the model used. The number of lattice sites occupied by the structural element [SiO 4/2 ] ( ), as in the case of [SrO] ( r SrO ), was equal to two.…”