Electronic Transitions in Perovskite: Possible Nonconvecting Layers in the Lower Mantle

James Badro, Jean-Pascal Rueff, György Vankó, Giulio Monaco, Guillaume Fiquet, François Guyot

doi:10.1126/science.1098840

Electronic Transitions in Perovskite: Possible Nonconvecting Layers in the Lower Mantle

DOI Web Site 被引用文献31件

James Badro

Laboratoire de Minéralogie Cristallographie de Paris (UMR CNRS 7590), Institut de Physique du Globe de Paris, Université Paris, 6 and 7, 4 Place Jussieu, 75252 Paris, France.
Jean-Pascal Rueff

Laboratoire de Minéralogie Cristallographie de Paris (UMR CNRS 7590), Institut de Physique du Globe de Paris, Université Paris, 6 and 7, 4 Place Jussieu, 75252 Paris, France.
György Vankó

Laboratoire de Minéralogie Cristallographie de Paris (UMR CNRS 7590), Institut de Physique du Globe de Paris, Université Paris, 6 and 7, 4 Place Jussieu, 75252 Paris, France.
Giulio Monaco

Laboratoire de Minéralogie Cristallographie de Paris (UMR CNRS 7590), Institut de Physique du Globe de Paris, Université Paris, 6 and 7, 4 Place Jussieu, 75252 Paris, France.
Guillaume Fiquet

Laboratoire de Minéralogie Cristallographie de Paris (UMR CNRS 7590), Institut de Physique du Globe de Paris, Université Paris, 6 and 7, 4 Place Jussieu, 75252 Paris, France.
François Guyot

Laboratoire de Minéralogie Cristallographie de Paris (UMR CNRS 7590), Institut de Physique du Globe de Paris, Université Paris, 6 and 7, 4 Place Jussieu, 75252 Paris, France.

抄録

<jats:p> We measured the spin state of iron in magnesium silicate perovskite (Mg <jats:sub>0.9</jats:sub> ,Fe <jats:sub>0.1</jats:sub> )SiO <jats:sub>3</jats:sub> at high pressure and found two electronic transitions occurring at 70 gigapascals and at 120 gigapascals, corresponding to partial and full electron pairing in iron, respectively. The proportion of iron in the low spin state thus grows with depth, increasing the transparency of the mantle in the infrared region, with a maximum at pressures consistent with the D″ layer above the core-mantle boundary. The resulting increase in radiative thermal conductivity suggests the existence of nonconvecting layers in the lowermost mantle. </jats:p>