Journal of Phase Equilibria

, Volume 20, Issue 6, pp 593–611 | Cite as

Experimental determination and computation of the liquid miscibility gap in the system CaO-MgO-SiO2-TiO2

  • M. Kirschen
  • C. DeCapitani
Basic And Applied Research

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.

Keywords

Rutile Excess Gibbs Energy Excess Function Excess Parameter Excess Term 

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Copyright information

© ASM International 1999

Authors and Affiliations

  • M. Kirschen
    • 1
  • C. DeCapitani
    • 1
  1. 1.Mineralogisch-Petrographisches InstitutBaselSwitzerland

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