Stability and equation of state of the post-perovskite phase in MgGeO3 to 2 Mbar

Atsushi Kubo; Boris Kiefer; Guoyin Shen; Vitali B. Prakapenka; Robert J. Cava; Thomas S. Duffy

doi:10.1029/2006GL025686

Stability and equation of state of the post-perovskite phase in MgGeO₃ to 2 Mbar

Atsushi Kubo
, Boris Kiefer
, Guoyin Shen
, Vitali B. Prakapenka
, Robert J. Cava
, Thomas S. Duffy

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

The stability and equation of state of the post-perovskite phase in MgGeO₃ were investigated to 2 Mbar by in situ x-ray diffraction experiments using the laser-heated diamond cell as well as by theoretical calculations using density functional theory. The stability of the phase was demonstrated at 92-201 GPa during laser heating. By using the Birch-Murnaghan equation of state, we obtained a zero-pressure volume (V₀) of 179.2 ± 0.7 Å³, bulk modulus (K₀) of 207 ± 5 GPa with a pressure derivative (K′₀) of 4.4 from experiments at room temperatures, and V₀ = 178.02 Å³, K₀ = 201.9 GPa, K′₀ = 4.34 from theoretical calculations at 0 K. The relative axial compressibilities of the silicate and germanate post-perovskite phases are similar although MgSiO₃ is more anisotropic than MgGeO₃.

Original language	English (US)
Article number	L12S12
Journal	Geophysical Research Letters
Volume	33
Issue number	12
DOIs	https://doi.org/10.1029/2006GL025686
State	Published - Jun 28 2006

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/2006GL025686

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@article{e20e3caa72b745acb864fb247a108204,

title = "Stability and equation of state of the post-perovskite phase in MgGeO3 to 2 Mbar",

abstract = "The stability and equation of state of the post-perovskite phase in MgGeO3 were investigated to 2 Mbar by in situ x-ray diffraction experiments using the laser-heated diamond cell as well as by theoretical calculations using density functional theory. The stability of the phase was demonstrated at 92-201 GPa during laser heating. By using the Birch-Murnaghan equation of state, we obtained a zero-pressure volume (V0) of 179.2 ± 0.7 {\AA}3, bulk modulus (K0) of 207 ± 5 GPa with a pressure derivative (K′0) of 4.4 from experiments at room temperatures, and V0 = 178.02 {\AA}3, K0 = 201.9 GPa, K′0 = 4.34 from theoretical calculations at 0 K. The relative axial compressibilities of the silicate and germanate post-perovskite phases are similar although MgSiO3 is more anisotropic than MgGeO3.",

author = "Atsushi Kubo and Boris Kiefer and Guoyin Shen and Prakapenka, \{Vitali B.\} and Cava, \{Robert J.\} and Duffy, \{Thomas S.\}",

year = "2006",

month = jun,

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doi = "10.1029/2006GL025686",

language = "English (US)",

volume = "33",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "John Wiley and Sons Inc.",

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TY - JOUR

T1 - Stability and equation of state of the post-perovskite phase in MgGeO3 to 2 Mbar

AU - Kubo, Atsushi

AU - Kiefer, Boris

AU - Shen, Guoyin

AU - Prakapenka, Vitali B.

AU - Cava, Robert J.

AU - Duffy, Thomas S.

PY - 2006/6/28

Y1 - 2006/6/28

N2 - The stability and equation of state of the post-perovskite phase in MgGeO3 were investigated to 2 Mbar by in situ x-ray diffraction experiments using the laser-heated diamond cell as well as by theoretical calculations using density functional theory. The stability of the phase was demonstrated at 92-201 GPa during laser heating. By using the Birch-Murnaghan equation of state, we obtained a zero-pressure volume (V0) of 179.2 ± 0.7 Å3, bulk modulus (K0) of 207 ± 5 GPa with a pressure derivative (K′0) of 4.4 from experiments at room temperatures, and V0 = 178.02 Å3, K0 = 201.9 GPa, K′0 = 4.34 from theoretical calculations at 0 K. The relative axial compressibilities of the silicate and germanate post-perovskite phases are similar although MgSiO3 is more anisotropic than MgGeO3.

AB - The stability and equation of state of the post-perovskite phase in MgGeO3 were investigated to 2 Mbar by in situ x-ray diffraction experiments using the laser-heated diamond cell as well as by theoretical calculations using density functional theory. The stability of the phase was demonstrated at 92-201 GPa during laser heating. By using the Birch-Murnaghan equation of state, we obtained a zero-pressure volume (V0) of 179.2 ± 0.7 Å3, bulk modulus (K0) of 207 ± 5 GPa with a pressure derivative (K′0) of 4.4 from experiments at room temperatures, and V0 = 178.02 Å3, K0 = 201.9 GPa, K′0 = 4.34 from theoretical calculations at 0 K. The relative axial compressibilities of the silicate and germanate post-perovskite phases are similar although MgSiO3 is more anisotropic than MgGeO3.

UR - https://www.scopus.com/pages/publications/33750625399

UR - https://www.scopus.com/pages/publications/33750625399#tab=citedBy

U2 - 10.1029/2006GL025686

DO - 10.1029/2006GL025686

M3 - Article

AN - SCOPUS:33750625399

SN - 0094-8276

VL - 33

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 12

M1 - L12S12

ER -

Stability and equation of state of the post-perovskite phase in MgGeO₃ to 2 Mbar

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