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

Research output: Contribution to journalArticle

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Abstract

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
JournalJournal of Geophysical Research
Volume94
Issue numberB12
Publication statusPublished - 1989
Externally publishedYes

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perovskite
Equations of state
equation of state
Perovskite
equations of state
Pressure
bulk modulus
X-Ray Diffraction
X-ray diffraction
Elastic moduli
core-mantle boundary
X ray diffraction
Betula
lower mantle
Synchrotrons
Diamond
anvils
phase transition
diffraction
Phase Transition

ASJC Scopus subject areas

  • Medicine(all)
  • Engineering(all)

Cite this

Mao, H. K., Chen, L. C., Hemley, R. J., Jephcoat, A. P., Wu, Y., & Bassett, W. A. (1989). Stability and equation of state of CaSiO3-perovskite to 134 GPa. Journal of Geophysical Research, 94(B12).

Stability and equation of state of CaSiO3-perovskite to 134 GPa. / Mao, H. K.; Chen, L. C.; Hemley, R. J.; Jephcoat, A. P.; Wu, Y.; Bassett, W. A.

In: Journal of Geophysical Research, Vol. 94, No. B12, 1989.

Research output: Contribution to journalArticle

Mao, HK, Chen, LC, Hemley, RJ, Jephcoat, AP, Wu, Y & Bassett, WA 1989, 'Stability and equation of state of CaSiO3-perovskite to 134 GPa', Journal of Geophysical Research, vol. 94, no. B12.
Mao HK, Chen LC, Hemley RJ, Jephcoat AP, Wu Y, Bassett WA. Stability and equation of state of CaSiO3-perovskite to 134 GPa. Journal of Geophysical Research. 1989;94(B12).
Mao, H. K. ; Chen, L. C. ; Hemley, R. J. ; Jephcoat, A. P. ; Wu, Y. ; Bassett, W. A. / Stability and equation of state of CaSiO3-perovskite to 134 GPa. In: Journal of Geophysical Research. 1989 ; Vol. 94, No. B12.
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AU - Chen, L. C.

AU - Hemley, R. J.

AU - Jephcoat, A. P.

AU - Wu, Y.

AU - Bassett, W. A.

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