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The Extrapolation of the SiO2-TiO2 Miscibility Gap on the CaO-MgO-SiO2-TiO2-Al2O3 System

Title data

Kirschen, Marcus ; De Capitani, Christian:
The Extrapolation of the SiO2-TiO2 Miscibility Gap on the CaO-MgO-SiO2-TiO2-Al2O3 System.
Event: Fall Meeting of the American Geophysical Union (AGU) , 8.-12. Dezember 1997 , San Francisco.
(Conference item: Conference , Paper )

Abstract in another language

Compositions of coexisting liquids depend only on the topology of the free energy surface of the melt. They represent experimental phase equilibrium data that directly constrain non-ideal solution parameters of the melt, because solid phases are not involved. In this study, the extrapolating behaviour of non-ideal SiO2-TiO2 solution parameters on a 5-component model system has been used to test the capability of some multicomponent solution models. Coexisting liquids in the silicate system MgO-CaO-SiO2-Al2O3-TiO2 have been synthesized at temperatures from 1500 to 2200C, ambiant pressure and quenched. Measured compositions of quenched liquids in aluminium free CST, MST and CMS systems at liquidus temperatures correspond roughly to the miscibility gaps proposed by DeVries et al. (1955), Massazza et al. (1958) and Greig (1927), respectively. Thermodynamic parameters for liquid and solid phases were derived from solvus and liquidus data by linear programming techniques. Non-ideal contributions of binary and ternary subsystems to the free energy of the melt were fitted with Margules polynomials and extrapolated with a generalized Kohler (1960) model. Phase diagrams were calculated with the Gibbs free energy minimizing algorithm "Theriak" (DeCapitani 1987).

Further data

Item Type: Conference item (Paper)
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
500 Science > 550 Earth sciences, geology
Date Deposited: 03 Jul 2019 07:43
Last Modified: 03 Jul 2019 07:43
URI: https://eref.uni-bayreuth.de/id/eprint/49793