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Kirschen, Marcus ; De Capitani, Christian:
Experimental Determination and Computation of the Liquid Miscibility Gap in the System CaO-MgO-SiO₂-TiO₂.
In: Journal of Phase Equilibria.
Bd. 20
(1999)
Heft 6
.
- S. 593-611.
ISSN 1054-9714
DOI: https://doi.org/10.1361/105497199770340581
Abstract
Coexisting liquids in the CaO-MgO-SiO₂-TiO₂ system were synthesized and quenched at ambient pressure in air from 1600 °C using a Rh-Pt resistance furnace and from 1800 to 2000 °C using a laser heated air levitation setup. Compositions of quenched glasses determined by electron microprobe analysis are reproduced in detail by weighted extrapolations of binary Margules-type excess functions. Using a generalized Kohler method, the authors illustrate the correlation between the degree of binary excess polynomials and their extrapolation behavior to higher-order systems. The presented extrapolation approach avoids additional ternary parameters in the CaO-SiO₂-TiO₂ and MgO-SiO₂-TiO₂ systems and affords a reasonable extrapolation outside of the compositional region of stable liquid immiscibility. In contrast, ternary excess parameters had to be added to binary interaction terms in the CaO-MgO-TiO₂ and CaO-MgO-SiO₂ systems to reproduce the solvus and liquidus phase relations reported in the literature. The excess entropy terms of the liquid were minimized in order to avoid unjustified stable miscibility gaps of the melt up to at least 3000 °C. The reliability of the authors’ polynomial approximation for the excess Gibbs energy of the melt is reduced only when ternary interaction terms are added to binary terms in the melt. However, the proposed method permits a valuable approximation of the highly complex excess Gibbs energy at solvus compositions in the system CaO-MgO-SiO₂-TiO₂ with a minimum number of excess terms.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften Forschungseinrichtungen > Institute in Verbindung mit der Universität > Fraunhofer-Zentrum für Hochtemperatur-Leichtbau (HTL) Fakultäten Forschungseinrichtungen Forschungseinrichtungen > Institute in Verbindung mit der Universität |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 14 Jun 2019 07:27 |
| Letzte Änderung: | 14 Jun 2019 07:27 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/49524 |