HR: 1340h
AN: MR23A-0179    [Abstracts]
TI: MgSiO$_{3}$ Under Conditions of the Earth's Deep Interior
AU: * Belonoshko, A B
EM: anatoly@fysik.uu.se
AF: Applied Materials Physics, Dept. of Materials Sci. & Eng., The Royal Inst of Technology, Brinellvagen 23, Stockholm, 100 44 Sweden
AU: * Belonoshko, A B
EM: anatoly@fysik.uu.se
AF: Condensed Matter Theory Group, Department of Physics, AlbaNova University Center, The Royal Inst of Technology, Roslagstullbacken 13, Stockholm, 10691 Sweden
AU: Skorodumova, N V
EM: snv@fysik.uu.se
AF: Condensed Matter Theory Group, Department of Physics, Uppsala University, BOX 530, Uppsala, 75121 Sweden
AU: Rosengren, A
EM: ar@condmat.physics.kth.se
AF: Condensed Matter Theory Group, Department of Physics, AlbaNova University Center, The Royal Inst of Technology, Roslagstullbacken 13, Stockholm, 10691 Sweden
AU: Ahuja, R
EM: rajeev@fysik.uu.se
AF: Condensed Matter Theory Group, Department of Physics, Uppsala University, BOX 530, Uppsala, 75121 Sweden
AU: Johansson, B
EM: borje@fysik.uu.se
AF: Applied Materials Physics, Dept. of Materials Sci. & Eng., The Royal Inst of Technology, Brinellvagen 23, Stockholm, 100 44 Sweden
AU: Johansson, B
EM: borje@fysik.uu.se
AF: Condensed Matter Theory Group, Department of Physics, Uppsala University, BOX 530, Uppsala, 75121 Sweden
AU: Burakovsky, L
EM: burakov@lanl.gov
AF: Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, Los Alamos, NM 87545 United States
AU: Preston, D
EM: dean@lanl.gov
AF: Physics Division, Los Alamos National Laboratory, Los Alamos, NM, Los Alamos, NM 87545 United States
AB: MgSiO$_{3}$ phase diagram has been studied theoretically by first principles static and both {\it ab initio} and semi-empirical molecular dynamics methods. The melting curve of MgSiO$_{3}$ was obtained also by dislocation-mediated theory of melting. All methods produce a consistent phase diagram of MgSiO$_{3}$, which is calculated up to pressure of 4 Mbar. At high pressure, the diagram shows presence of three MgSiO$_{3}$ phases, namely, perovskite, so-called post-perovskite, and liquid. The diagram is in good agreement with the recent experimental data on post-perovskite phase. The MgSiO$_{3}$ melting curve is rather steep at pressures under 100 GPa while at higher pressures it has a much lower slope and lies above that of Fe by about 1000 K
DE: 3924 High-pressure behavior
SC: Mineral and Rock Physics [MR]
MN: 2004 AGU Fall Meeting