Electronic Spin Crossover of Iron in Ferroperclase in Earth?s Lower Mantle

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Pressure-induced electronic spin-pairing transitions of iron and associated effects on the physical properties have been reported to occur in the lower-mantle ferropericlase, silicate perosvkite, and perhaps in post silicate perovskite at high pressures and room temperature. These recent results are motivating geophysicists and geodynamicists to reevaluate the implications of spin transitions on the seismic heterogeneity, composition, as well as the stability of the thermal upwellings of the Earth's lower mantle. Here we have measured the spin states of iron in ferropericlase and its crystal structure up to 95 GPa and 2000 K using a newly constructed X-ray emission spectroscopy and ... continued below

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Lin, J F; Vanko, G; Jacobsen, S D; Iota, V; Struzhkin, V V; Prakapenka, V B et al. January 25, 2007.

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Pressure-induced electronic spin-pairing transitions of iron and associated effects on the physical properties have been reported to occur in the lower-mantle ferropericlase, silicate perosvkite, and perhaps in post silicate perovskite at high pressures and room temperature. These recent results are motivating geophysicists and geodynamicists to reevaluate the implications of spin transitions on the seismic heterogeneity, composition, as well as the stability of the thermal upwellings of the Earth's lower mantle. Here we have measured the spin states of iron in ferropericlase and its crystal structure up to 95 GPa and 2000 K using a newly constructed X-ray emission spectroscopy and diffraction with the laser-heated diamond cell. Our results show that an isosymmetric spin crossover occurs over a pressure-temperature range extending from the upper part to the lower part of the lower mantle, and low-spin ferropericlase likely exists in the lowermost mantle. Although continuous changes in physical and chemical properties are expected to occur across the spin crossover, the spin crossover results in peculiar behavior in the thermal compression and sound velocities. Therefore, knowledge of the fraction of the spin states in the lower-mantle phases is thus essential to correctly evaluate the composition, geophysics, and dynamics of the Earth's lower mantle.

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PDF-file: 19 pages; size: 0.2 Mbytes

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  • Journal Name: Science, vol. 317, n/a, September 21, 2007, pp. 1740-1743; Journal Volume: 317

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  • Report No.: UCRL-JRNL-227767
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 919593
  • Archival Resource Key: ark:/67531/metadc895546

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 25, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 8, 2016, 3:45 p.m.

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Lin, J F; Vanko, G; Jacobsen, S D; Iota, V; Struzhkin, V V; Prakapenka, V B et al. Electronic Spin Crossover of Iron in Ferroperclase in Earth?s Lower Mantle, article, January 25, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc895546/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.