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• W2068677515 endingPage "20481" @default.
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• W2068677515 abstract "A double‐stage multianvil system was developed to conduct in situ X ray diffraction study at high pressures. The system generates pressures and temperature above 25 GPa and 1200°C and has been used in conjunction with intense synchrotron radiation to study the phase transitions of MgSiO 3 and the thermal expansion of MgSiO 3 perovskite. At pressures between 20 and 30 GPa, we observed a series of phase transitions from spinel+stishovite through ilmenite to perovskite. Spinel+stishovite transforms into ilmenite at 20.0±1.0 GPa, and ilmenite transforms into perovskite at 24.0±0.5 GPa at 800°C. The phase boundary between ilmenite and perovskite is estimated to be P (GPa) = (24.0±0.5) ‐ (0.0025±0.0025)(T‐800)(°C) by combining the present results and previous constraints on the slope of the phase boundary from the thermodynamic properties. Measured unit cell parameters of MgSiOs perovskite indicate that the average volumetric thermal expansion coefficient of MgSiOs perovskite over 25°–1200°C is 2.0±0.4×10 −5 K −1 at 25 GPa. These results provide the phase stability relation of MgSiO 3 and the thermal equation of state of MgSiO 3 perovskite at pressures corresponding to the boundary between the upper and lower mantle. However, uncertainties involved in extrapolating to the actual mantle temperatures do not allow evaluation of the chemical structure near the 670 km discontinuity in the mantle." @default.
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• W2068677515 date "1995-10-10" @default.
• W2068677515 modified "2023-09-27" @default.
• W2068677515 title "In situ X ray observation of high-pressure phase transitions of MgSiO₃and thermal expansion of MgSiO₃perovskite at 25 GPa by double-stage multianvil system" @default.
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• W2068677515 doi "https://doi.org/10.1029/95jb01688" @default.
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