TY - JOUR
T1 - Reduced radiative conductivity of low-spin (Mg,Fe)O in the lower mantle
AU - Goncharov, Alexander F.
AU - Struzhkin, Viktor V.
AU - Jacobsen, Steven D.
PY - 2006/5/26
Y1 - 2006/5/26
N2 - 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.
AB - 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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U2 - 10.1126/science.1125622
DO - 10.1126/science.1125622
M3 - Article
C2 - 16728639
AN - SCOPUS:33744502089
VL - 312
SP - 1205
EP - 1208
JO - Science
JF - Science
SN - 0036-8075
IS - 5777
ER -