PVT relations in MgO: a ultra-high PT scale for planetary sciences applications

Details PVT relations in MgO: a ultra-high PT scale for planetary sciences applications PVT relations in MgO: a ultra-high PT scale for planetary sciences applications

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmmr52a..07w&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #MR52A-07

Other

3611 Thermodynamics (0766, 1011, 8411), 3919 Equations Of State, 3929 Nmr, Mossbauer Spectroscopy, And Other Magnetic Techniques, 3939 Physical Thermodynamics, 3949 Thermal Expansivity

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 primarily by LDA quasiharmonic (QHA) calculations. Within the range of validity of the QHA these EoSs agree very well with shock data. They have been used here to reinvestigate the post-spinel and post- perovskite transitions.

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