HR: 0830h
AN: S21E-0376    [PDF]
TI: Electronic spin state of iron in lower mantle perovskite
AU: * Li, J
EM: jackieli@uiuc.edu
AF: University of Illinois Urbana Champaign, 1301 West Green St., Urbana, IL 61801 United States
AU: * Li, J
EM: jackieli@uiuc.edu
AF: Carnegie Institution of Washington, 5251 Broad Branch Rd., Washington, DC 20015 United States
AU: Struzhkin, V
AF: Carnegie Institution of Washington, 5251 Broad Branch Rd., Washington, DC 20015 United States
AU: Mao, H
AF: Carnegie Institution of Washington, 5251 Broad Branch Rd., Washington, DC 20015 United States
AU: Shu, J
AF: Carnegie Institution of Washington, 5251 Broad Branch Rd., Washington, DC 20015 United States
AU: Hemley, R
AF: Carnegie Institution of Washington, 5251 Broad Branch Rd., Washington, DC 20015 United States
AU: Fei, Y
AF: Carnegie Institution of Washington, 5251 Broad Branch Rd., Washington, DC 20015 United States
AU: Mysen, B
AF: Carnegie Institution of Washington, 5251 Broad Branch Rd., Washington, DC 20015 United States
AU: Dera, P
AF: Carnegie Institution of Washington, 5251 Broad Branch Rd., Washington, DC 20015 United States
AU: Prapapenka, V
AF: University of Chicago, 9700 South Cass Ave., Argonne, IL 60637 United States
AU: Shen, G
AF: University of Chicago, 9700 South Cass Ave., Argonne, IL 60637 United States
AB: Thirty years ago, Gaffney and Anderson (JGR 1973) were among the first to discuss the effect of low-spin iron on the lower mantle composition. Only during the past few years, breakthroughs in synchrotron X-ray technology allowed detection of low-spin iron under high pressures by using high-resolution X-ray emission spectroscopy. We present experimental evidence for a gradual electronic spin-pairing transition of iron in two perovskite samples over the lower mantle pressure range. Given the difference in the electronic structure of iron between the initial high-spin state and the intermediate spin state at 100 GPa, the observed spin-pairing transition would have significant influences on the physical properties and chemical differentiation of the deep interior of the Earth.
DE: 3620 Crystal chemistry
DE: 3900 MINERAL PHYSICS
DE: 3924 High-pressure behavior
DE: 3929 NMR, Mossbauer spectroscopy, and other magnetic techniques
DE: 7207 Core and mantle
SC: Seismology [S]
MN: 2003 Fall Meeting