Journal
SCIENCE
Volume 312, Issue 5777, Pages 1205-1208Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1125622
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Optical absorption spectra have been measured at pressures up to 80 gigapascals (GPa) for the tower-mantle oxide magnesiowustite (Mg,Fe)O. Upon reaching the high-spin to tow-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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