HR: 1340h
AN: MR23C-1524    [Abstracts]
TI: Investigation of high-pressure MgCO3 phases
AU: * Wan, J T
EM: jwan@phy.cuhk.edu.hk
AF: Department of Physics, Science Centre North Block, The Chiense University of Hong Kong, Shatin, NT, Hong Kong
AB: The high-pressure phases of magnesium carbonate are investigated by variable cell first-principles molecular dynamics simulations. At pressures compatible to lower mantle conditions (~120 GPa), the carbon atoms are surrounded by 4 oxygen atoms, which is consistent with the work of Skorodumova et al. (2005). Perovskite phase is observed at pressures greater than 300 GPa, but its stability is still subject to further studies. In addition, the possibility of getting post-perovskite phase is also discussed. The results may be useful to the constructions of interior models of giant planets, which may lead to a better understanding in giant plants physics.
DE: 3620 Mineral and crystal chemistry (1042)
DE: 3654 Ultra-high pressure metamorphism
DE: 3919 Equations of state
DE: 3924 High-pressure behavior
DE: 5460 Physical properties of materials
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting