Abstract
Based on our previous thermodynamic model of high pressure melting of any solid that is stable under ambient pressure (Wang et al., J. Alloys Comp. 299 (2000) 287–291), we have derived a few equations to calculate the melting temperatures of the metastable phases synthesized at high pressures. Compared to obtained results of high pressure melting of pyrope (Mg 3Al 2Si 3O 12) stable at ambient condition, both CaSiO 3 and MgSiO 3 perovskites have been used to calculate the melting temperatures at high pressures. The reliability of the improved model has been well demonstrated by a reasonable agreement between the calculated melting temperatures and experimental data. Comparison between obtained results with those estimated by the empirical melting equations indicates that our model is more precise than the empirical melting equations in extrapolating the melting temperatures at higher pressures.
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