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

J. Badro 1, 2 Jean-Pascal Rueff 3 György Vanko 4 Giulio Monaco 4 Guillaume Fiquet 5 François Guyot 5
1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 IPGP - Institut de Physique du Globe de Paris
3 Laboratoire de Chimie Physique–Ma-tie`re et Rayonnement (UMR CNRS 7614), Universite ́Paris, 6 11 Rue Pierre et Marie Curie, 75231 Paris,France.
4 European Synchrotron Radiation Facility(ESRF), B.P. 220 F-38043 Grenoble CEDEX, France
5 Laboratoire de Mine ́ralogie Cristallographie de Paris(UMR CNRS 7590), Institut de Physique du Globe deParis, Universite ́ Paris, 6 and 7, 4 Place Jussieu, 75252Paris, France.
Abstract : We measured the spin state of iron in magnesium silicate perovskite (Mg-0.9,Fe-0.1) SiO3 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.
Keywords : KeyWords Plus:RAY-EMISSION SPECTROSCOPY VARIABLE THERMAL-CONDUCTIVITY PHASE-TRANSITION EARTHS MANTLE HEAT-TRANSFER PRESSURE ABSORPTION CONVECTION EQUATION STATE
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https://hal-insu.archives-ouvertes.fr/insu-02914406
Contributor : Eva Fareau <>
Submitted on : Tuesday, August 11, 2020 - 5:35:15 PM
Last modification on : Tuesday, September 1, 2020 - 3:07:10 AM

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INSU | IMPMC | ALLINSP | SORBONNE-UNIVERSITE | CNRS | UNIV-PARIS7 | IPGP | SU-SCIENCES | UPMC | USPC | AFRIQ

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J. Badro, Jean-Pascal Rueff, György Vanko, Giulio Monaco, Guillaume Fiquet, et al.. Electronic Transitions in Perovskite: Possible Nonconvecting Layers in the Lower Mantle. Science, American Association for the Advancement of Science, 2004, 305 (5682), pp.383-386. ⟨10.1126/science.1098840⟩. ⟨insu-02914406⟩

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