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Kirschen, Marcus ; Millot, Francis ; Rifflet, Jean-Claude ; Coutures, Jean-Pierre ; De Capitani, Christian:
Immiscible silicate liquids in the system SiO₂-TiO₂-Al₂O₃.
In: European Journal of Mineralogy.
Bd. 11
(1999)
Heft 3
.
- S. 427-440.
ISSN 1617-4011
DOI: https://doi.org/10.1127/ejm/11/3/0427
Abstract
Abstract Coexisting liquids in the SiO₂-TiO₂-Al₂O₃ system have been synthesized at 2000 K to 2500 K with a laserheated air levitation set-up in order to determine the SiO₂-TiO₂ miscibility gap and its extrapolation to the Al₂O₃-bearing system. Compositions of quenched coexisting liquids in the SiO₂-TiO₂ and SiO₂-TiO₂-Al₂O₃ system demonstrate the dramatic decline of the miscibility gap when as little as 3 mol% Al₂O₃ is added. With bulk compositions containing 10 mol% Al₂O₃ we found no evidence of a stable liquid-liquid phase separation above 2073 K. While experimental liquidus data in the three binary subsystems can be modelled with Margules-type excess polynomials for the melt, the calculated ternary miscibility gap is strongly discrepant with experiments when conventional extrapolation methods are applied. To overcome this problem we propose a generalized extrapolation method based on weighting of the binary excess polynomials. Applying this multicomponent excess function an additional ternary excess term is not required and the experimentally determined liquid miscibility gap is reproduced in detail. Extrapolation outside the immiscibility region yields a valuable first-order approximation of the excess Gibbs free energy of the melt.
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 07:20 |
| Letzte Änderung: | 14 Jun 2019 07:20 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/49523 |