Abstract
In order to provide an adequate basis for extrapolation into higher order oxide systems, a thermodynamic assessment was performed on the BaO-CaO, BaO-SrO, BaO-SiO2 and SrO-SiO2 binary systems by critically evaluating the available experimental data and Previous thermodynamic modeling. Associate solution model was applied to describe the molten phase in the BaO-SiO2 and SrO-SiO2 systems. Two associates, Ba2SiO4 and BaSiO3, were tested and compared with the previous assessment with only one associate Ba2SiO4. A set of self-consistent thermodynamic parameters for the descriptions of each oxide system is presented. The phase diagrams, thermodynamic properties including activities, standard enthalpies of formation at 298.15 K and enthalpy increments were calculated according to the thermodynamic parameters acquired in the present work. For the BaO-SiO2 and SrO-SiO2 systems, the site fractions of species in the liquid were calculated to illustrate the chemical short-range order tendency of the compound(s) in the liquid phase. (C) 2016 Elsevier Ltd. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 107-116 |
| Number of pages | 10 |
| Journal | Calphad: Computer Coupling of Phase Diagrams and Thermochemistry |
| Volume | 54 |
| DOIs | |
| Publication status | Published - Sept 2016 |
| MoE publication type | A1 Journal article-refereed |
Funding
This research was financially supported by Association of Finnish Steel and Metal Producers, Tekes and System Integrated Metal Processes (SIMP) program by FIMECC.
Keywords
- CALPHAD
- Associate solution model
- BaO
- STANDARD MOLAR ENTHALPIES
- PHASE-EQUILIBRIA
- DIELECTRIC-PROPERTIES
- SILICATE-GLASSES
- HEAT-CAPACITY
- BINARY-SYSTEM
- OXIDE-SILICA
- STRONTIUM
- BARIUM
- MICROSTRUCTURE
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