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Mineralogical Magazine; August 2002; v. 66; no. 4; p. 513-536; DOI: 10.1180/0026461026640046
© 2002 Mineralogical Society of Great Britain and Ireland
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Thermodynamics of mixing and ordering in the diopside–jadeite system: I. A CVM model

V. L. Vinograd1,2

1 Institut für Mineralogie, J. W. Goethe Universität, Senckenberganlage 30, 60054 Frankfurt, Germany
2 Institut für Mineralogie, Universität Münster, Corrensstrasse 24, D-48149 Münster, Germany

* E-mail: vinogra{at}uni-muenster.de

Solution calorimetry and phase equilibrium data for the diopside–jadeite system are assessed using a combination of the cluster variation method (CVM) and Redlich-Kister (RK) polynomial expansion. The CVM is used to model part of the free energy of mixing which depends on short-range order (SRO) and long-range order (LRO) effects. The SRO/LRO independent part of the free energy is modelled using an RK polynomial. The parameters of the RK and CVM models are obtained through the fit to the experimental data. The best-fit parameters are used to calculate activity-composition relations and a temperature-composition phase diagram of the diopside–jadeite system.

KEYWORDS: thermodynamics, cluster variation method, short-range order, diopside–jadeite system




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