HR: 0800h
AN: DI41A-0347 INVITED [Abstracts]
TI: PVT relations in MgO: a ultra-high PT scale for planetary sciences applications
AU: * Wentzcovitch, R M
EM: wentzcov@cems.umn.edu
AF: Department of Chemical Engineering and Materials Science and Minnesota
Supercomputer Institute, University of Minnesota, 421 Washington Ave SE, Minneapolis, MN 55455, United States
AU: Zhongqing, W
EM: wuzq@cems.umn.edu
AF: Department of Chemical Engineering and Materials Science and Minnesota
Supercomputer Institute, University of Minnesota, 421 Washington Ave SE, Minneapolis, MN 55455, United States
AU: Umemoto, K
EM: umemoto@cems.umn.edu
AF: Department of Chemical Engineering and Materials Science and Minnesota
Supercomputer Institute, University of Minnesota, 421 Washington Ave SE, Minneapolis, MN 55455, United States
AU: Li, B
EM: bli@notes.cc.sunysb.edu
AF: Department of Geosciences, Stony Brook University, 255 Earth and Space Sciences
Building (ESS), Stony Brook, NY 11794, United States
AU: Zheng, J
EM: jczheng@bnl.gov
AF: Department of Physics, Brookhaven National Laboratory, Bldg. 510, Upton, NY 11794,
United States
AU: Hirose, K
EM: kei@geo.titech.ac.jp
AF: Department of Earth and Planetary Sciences,Tokyo Institute of Technology, 2-12-1
Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
AB:
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)
DE: 1011 Thermodynamics (0766, 3611, 8411)
DE: 3611 Thermodynamics (0766, 1011, 8411)
DE: 3919 Equations of state
DE: 3924 High-pressure behavior
DE: 8411 Thermodynamics (0766, 1011, 3611)
SC: Study of the Earth's Deep Interior [DI]
MN: 2007 Fall Meeting