Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3312s12k&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 12, CiteID L12S12
Physics
13
Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
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.
Cava Robert. J.
Duffy Thomas S.
Kiefer Boris
Kubo Atsushi
Prakapenka Vitali B.
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