Reduced radiative conductivity of low-spin (Mg,Fe)O in the lower mantle

Alexander F. Goncharov*, Viktor V. Struzhkin, Steven D. Jacobsen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

139 Scopus citations

Abstract

Optical absorption spectra have been measured at pressures up to 80 gigapascals (GPa) for the lower-mantle oxide magnesiowüstite (Mg,Fe)O. Upon reaching the high-spin to low-spin transition of Fe2+ at about 60 GPa, we observed enhanced absorption in the mid- and near-infrared spectral range, whereas absorption in the visible-ultraviolet was reduced. The observed changes in absorption are in contrast to prediction and are attributed to d-d orbital charge transfer in the Fe2+ ion. The results indicate that low-spin (Mg,Fe)O will exhibit lower radiative thermal conductivity than high-spin (Mg,Fe)O, which needs to be considered in future geodynamic models of convection and plume stabilization in the lower mantle.

Original languageEnglish (US)
Pages (from-to)1205-1208
Number of pages4
JournalScience
Volume312
Issue number5777
DOIs
StatePublished - May 26 2006

ASJC Scopus subject areas

  • General

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