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Immiscible silicate liquids in the system SiO₂-TiO₂-Al₂O₃

Title data

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. Vol. 11 (1999) Issue 3 . - pp. 427-440.
ISSN 1617-4011
DOI: https://doi.org/10.1127/ejm/11/3/0427

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Research Institutions > Affiliated Institutes > Fraunhofer Center for High Temperature Materials and Design (HTL)
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 14 Jun 2019 07:20
Last Modified: 14 Jun 2019 07:20
URI: https://eref.uni-bayreuth.de/id/eprint/49523