Title
Critical assessments and thermodynamic modeling of BaO-<tex>$SiO_{2}$</tex> and <tex>$SiO_{2}$</tex>-<tex>$TiO_{2}$</tex> systems and their extensions into liquid immiscibility in the BaO-<tex>$SiO_{2}$</tex>-<tex>$TiO_{2}$</tex> system Critical assessments and thermodynamic modeling of BaO-<tex>$SiO_{2}$</tex> and <tex>$SiO_{2}$</tex>-<tex>$TiO_{2}$</tex> systems and their extensions into liquid immiscibility in the BaO-<tex>$SiO_{2}$</tex>-<tex>$TiO_{2}$</tex> system
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Oxford ,
Subject
Physics
Chemistry
Source (journal)
Calphad computer coupling of phase diagrams and thermochemistry. - Oxford
Volume/pages
47(2014) , p. 68-82
ISSN
0364-5916
ISI
000346224700008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
This study discusses rational reproduction of liquid immiscibility in the BaO-SiO2-TiO2 system. While a ternary assessment requires sub-binary descriptions in the same thermodynamic model, the related sub-binary systems BaO-SiO2, BaO-TiO2 and SiO2-TiO2 liquid and solid phases have been evaluated using different thermodynamic models in the literature. In this study, BaO-SiO2 and SiO2-TiO2 were assessed using the Ionic Two Sublattice model (I2SL) based on experimental data from the literature. BaO-TiO2 was already assessed using this model. Binary descriptions developed were then used for the assessment of liquid immiscibility in the BaO-SiO2-TiO2 system. Ternary interaction parameters were found necessary for rational reproduction of the new ternary experimental data gathered in the present work. The model parameters for each system were evaluated using a CAPLHAD approach. A set of parameters is proposed. They show good agreement between the calculated and experimental equilibrium liquidus, liquid immiscibility and thermochemical properties in the BaO-SiO2-TiO2 system. (C) 2014 Elsevier Ltd. All rights reserved.
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