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Analysis of pressure-volume-temperature relationships for MgSiO3 perovskite
P. K. Singh
We have determined pressure-volume-temperature relationships for MgSiO3 perovskite at high pressures up to a pressure of 360GPa, and temperatures up to 3000K. The results are described using the Holzapfel equation of state and the Stacey reciprocal K-primed equation. The two equations of state for MgSiO3 are found to be in reasonably good agreement with each other. The equation of state parameters have been obtained at atmospheric pressure and selected temperatures using thermodynamic identities for the temperature derivatives of isothermal bulk modulus and its pressure derivative. The results have been obtained using the parameters in the two equations of state, and compared with the previously reported experimental data.
Keywords: Equations of state, bulk modulus, pressure derivatives, silicate