HR: 10:35h
AN: MR22A-02 INVITED    [Abstracts]
TI: Elasticity of Ferropericlase at Earth's Lower Mantle Conditions
AU: * Wentzcovitch, R M
EM: wentzcov@cems.umn.edu
AF: Department of Chemical Engineering and Materials Science and Minnesota Supercomputer Institute, 421 Washington Ave SE, Minneapolis, MN 55455, United States
AU: Justo, J
EM: justo001@umn.edu
AF: Department of Chemical Engineering and Materials Science and Minnesota Supercomputer Institute, 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, 421 Washington Ave SE, Minneapolis, MN 55455, United States
AU: da Silva, C
EM: cesards@msi.umn.edu
AF: Department of Chemical Engineering and Materials Science and Minnesota Supercomputer Institute, 421 Washington Ave SE, Minneapolis, MN 55455, United States
AB: The thermoelastic properties of ferropericlase Mg(1-x)FexO (x = 0.1875) across the iron high-to-low spin crossover have been investigated by combining first principles calculations with a novel thermodynamics model of this system. At room temperature the transition is somewhat sharp and the effect on the bulk modulus is quite dramatic. Along a typical geotherm the transition should occur across most of the lower mantle with a noticeable bulk modulus reduction in the mid lower mantle. This transition should also alter noticeably the magnitude of velocity heterogeneities caused by lateral temperature changes. Research supported by NSF/EAR, NSF/ITR (VLab), and MSI(U of MN)
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: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting