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


    147 被引用数 (Scopus)


    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

    ジャーナルJournal of Geophysical Research
    出版ステータスPublished - 1989

    ASJC Scopus subject areas

    • 地球物理学
    • 林業
    • 海洋学
    • 水圏科学
    • 生態学
    • 水の科学と技術
    • 土壌科学
    • 地球化学および岩石学
    • 地表過程
    • 大気科学
    • 地球惑星科学(その他)
    • 宇宙惑星科学
    • 古生物学


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