Thermodynamics of mixing in an isostructural solid solution: Simulation methodologies and application to the rutile-cassiterite system
-
Xin Liu
, Victor L. Vinograd, Xiancai Lu
, Egor V. Leonenko
, Nikolay N. Eremin , Rucheng Wang and Björn Winkler
Abstract
The accuracies of two different approaches to model thermodynamic mixing properties of solid solutions are explored using the rutile-cassiterite solid solution as an example. Both methods employ an expansion of the configurational enthalpy in terms of pairwise interactions energies. In the first method the partition function is directly computed from the excess energies of all Ti/Sn configurations within a 2 × 2 × 4 supercell. In the second method the free energy of mixing is calculated by a thermodynamic integration of the thermally averaged enthalpies computed with the Monte Carlo method using an 8 × 12 × 16 supercell. The phase relations derived from Monte Carlo simulations agree well with the available experimental data, under the condition that the free energy is corrected for the effect of the excess vibrational entropy. The direct calculation of the partition function provides reasonable phase relations only when the configurational entropy is corrected to be consistent with the ideal mixing in the high-temperature limit. Advantages and drawbacks of the both approaches are discussed. The findings are generally applicable to models of isostructural solid solutions.
Acknowledgments
We acknowledge National Science Foundation of China (Nos. 41425009 and 41230315) and the financial support from the State Key Laboratory for Mineral Deposits Research of China. We acknowledge the computational support from the Juelich Supercomputing Centre, from the Centre for Scientific Computing at the University of Frankfurt, and from the High Performance Computing Center of Nanjing University. X.L. is grateful to the China Scholarship Council for financial support. The authors also thank J.D. Gale (Curtin University) for the help in developing the force-field model.
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- Coupled substitution of Fe3+ and H+ for Si in wadsleyite: A study by polarized infrared and Mössbauer spectroscopies and single-crystal X-ray diffraction
- Research Article
- New Mineral Names