Electronic transitions in perovskite: Possible nonconvecting layers in the lower mantle

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

Research output: Contribution to journalArticle

324 Citations (Scopus)

Abstract

We measured the spin state of iron in magnesium silicate perovskite (Mg0.9,Fe0.1)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.

Original languageEnglish
Pages (from-to)383-386
Number of pages4
JournalScience
Volume305
Issue number5682
DOIs
Publication statusPublished - Jul 16 2004

ASJC Scopus subject areas

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