Calorimetric measurements of perovskites in the system CaTiO3-CaSiO3 and experimental and calculated phase equilibria for high-pressure dissociation of diopside

Details Calorimetric measurements of perovskites in the system CaTiO3-CaSiO3 and experimental and calculated phase equilibria for high-pressure dissociation of diopside Calorimetric measurements of perovskites in the system CaTiO3-CaSiO3 and experimental and calculated phase equilibria for high-pressure dissociation of diopside

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..120....1k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 120, Issue 1-2, p. 1-10.

Physics

6

Scientific paper

Enthalpies of perovskite solid solutions in the system CaTiO3-CaSiO3 synthesized at high pressure and of CaSiO3 wollastonite were measured by drop-solution calorimetry techniques at 805°C. Extrapolation of the measured enthalpy-composition relationship of the perovskites allowed us to estimate the enthalpy of wollastonite-perovskite transition in CaSiO3 at 25°C as 109.5+/-6.3 kJ/mol. Phase transitions in CaMgSi2O6 diopside at high pressures and high temperatures were examined using a multi-anvil apparatus. At 18 GPa and 900-1200°C, diopside first dissociated into a mixture of Mg2SiO4 spinel, stishovite and CaSiO3 perovskite. The dissociation pressure was almost independent of temperature. The three-phase mixture changed into a mixture of MgSiO3 ilmenite and CaSiO3 perovskite at 19 GPa. The dissociation boundary of diopside into the mixture of Mg2SiO4 spinel, stishovite and CaSiO3 perovskite was also calculated, using the enthalpy of dissociation of diopside obtained by combining the enthalpy of the CaSiO3 wollastonite-perovskite transition with other relevant thermodynamic data. The calculated boundary was almost consistent with that determined by the phase transition experiments.

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