Stability and equation of state of CaSiO3-perovskite to 134 GPa

H. K. Mao, L. C. Chen, R. J. Hemley, A. P. Jephcoat, Y. Wu, W. A. Bassett

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    The stability and P-V equation of state of CaSiO3 have been investigated using in situ diamond-anvil X-ray diffraction techniques to 134 GPa, a pressure equivalent to that at the core-mantle boundary. Samples were heated by YAG laser at each pressure increment at high pressures to accelerate phase transitions. X-ray diffraction measurements were carried out at 300 K using both energy-dispersive synchrotron and sealed-tube film techniques. Quenched CaSiO3-perovskite was observed to remain metastable close to 0.1 MPa, and to convert rapidly to an amorphous phase on pressure release. The simple cubic perovskite phase of CaSiO3 was found to be the stable phase for all lower mantle pressure conditions. All 47 P-V data points were used to obtain a third-order Birch-Murnaghan equation of state with zero-pressure parameters: unit cell volume V0 = 45.37 ± (0.08) Å3, density ρ0 = 4.252(±0.008) Mg/m3, and bulk modulus K0 = 281(±4) GPa, with an assumed bulk modulus pressure K0′ = 4. -from Authors

    Original languageEnglish
    Pages (from-to)17,889-17,894
    JournalJournal of Geophysical Research
    Issue numberB12
    Publication statusPublished - 1989

    ASJC Scopus subject areas

    • Geophysics
    • Forestry
    • Oceanography
    • Aquatic Science
    • Ecology
    • Water Science and Technology
    • Soil Science
    • Geochemistry and Petrology
    • Earth-Surface Processes
    • Atmospheric Science
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science
    • Palaeontology


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