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  • Title: Reduced radiative conductivity of low-spin (Mg,Fe)O in the lower mantle.
    Author: Goncharov AF, Struzhkin VV, Jacobsen SD.
    Journal: Science; 2006 May 26; 312(5777):1205-8. PubMed ID: 16728639.
    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.
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