Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmdi41a0347w&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #DI41A-0347
Physics
1011 Thermodynamics (0766, 3611, 8411), 3611 Thermodynamics (0766, 1011, 8411), 3919 Equations Of State, 3924 High-Pressure Behavior, 8411 Thermodynamics (0766, 1011, 3611)
Scientific paper
In situ crystallography based on diamond anvil cells have recently been extended to the multi-Mbar regime. Temperatures in these experiments have crossed the 2,000 K mark. Yet, current high PT standards of calibration produce too large uncertainties to the point of forbidding clear conclusions regarding the significance of certain phenomena for planetary processes at these high PTs, e.g., the post-perovskite transition in Earth's mantle. We propose a calibration based on thermal equations of state (EoS) of MgO obtained by combining LDA quasiharmonic (QHA) calculations up to ultrahigh PTs and experimental data at moderately high PTs. Within the range of validity of the QHA the resulting EoSs agree very well with shock data. They have been used here to reinvestigate the post-spinel and post-perovskite transitions. Research supported by NSF/EAR and NSF/ITR (VLab)
Hirose Kosuke
Li Baowen
Umemoto Koichiro
Wentzcovitch Renata M.
Zheng Jing
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