Abstract
Static lattice energy calculations (SLEC), based on empirical interatomic potentials, have been performed for a set of 800 different structures in a 2 × 2 × 4 supercell of C2/c diopside with compositions between diopside and jadeite, and with different states of order of the exchangeable Na/Ca and Mg/Al cations. Excess static energies of these structures have been cluster expanded in a basis set of 37 pair-interaction parameters. These parameters have been used to constrain Monte Carlo simulations of temperature-dependent properties in the range of 273–2,023 K and to calculate a temperature–composition phase diagram. The simulations predict the order–disorder transition in omphacite at 1,150 ± 20°C in good agreement with the experimental data of Carpenter (Mineral Petrol 78:433–440, 1981). The stronger ordering of Mg/Al within the M1 site than of Ca/Na in the M2 site is attributed to the shorter M1–M1 nearest-neighbor distance, and, consequently, the stronger ordering force. The comparison of the simulated relationship between the order parameters corresponding to M1 and M2 sites with the X-ray refinement data on natural omphacites (Boffa Ballaran et al. in Am Mineral 83:419–433, 1998) suggests that the cation ordering becomes kinetically ineffective at about 600°C.
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The support of the Deutsche Forschungsgemeinschaft (grant Wi 1232/27-1) is gratefully acknowledged. JDG thanks the Government of Western Australia for support through a Premier’s Research Fellowship.
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Vinograd, V.L., Gale, J.D. & Winkler, B. Thermodynamics of mixing in diopside–jadeite, CaMgSi2O6–NaAlSi2O6, solid solution from static lattice energy calculations. Phys Chem Minerals 34, 713–725 (2007). https://doi.org/10.1007/s00269-007-0189-z
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DOI: https://doi.org/10.1007/s00269-007-0189-z