Reduced Radiative Conductivity of Low-Spin (Mg,Fe)O in the Lower Mantle

Details Reduced Radiative Conductivity of Low-Spin (Mg,Fe)O in the Lower Mantle Reduced Radiative Conductivity of Low-Spin (Mg,Fe)O in the Lower Mantle

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sci...312.1205g&link_type=abstract

Science, Volume 312, Issue 5777, pp. 1205-1207 (2006).

Physics

50

Scientific paper

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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