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Equations of State of Ca-Silicates and Phase Diagram of the CaSiO3 System under Upper Mantle Conditions
The equations of state of different phases in the CaSiO3 system (wollastonite, pseudowollastonite, breyite (walstromite), larnite (Ca2SiO4), titanite-structured CaSi2O5 and CaSiO3-perovskite) are constructed using a thermodynamic model based on the Helmholtz free energy. We used known experimental measurements of heat capacity, enthalpy, and thermal expansion at zero pressure and high temperatures, and volume measurements at different pressures and temperatures for calculation of parameters ofdoi:10.3390/min11030322 fatcat:tgxspxeycvhdhkpap4riu6czoq