Effects of Fe spin transition on the elasticity of (Mg,Fe)O magnesiow�ustites and implications for the seismological properties of the Earth's lower mantle

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High-pressure x-ray diffraction of (Mg{sub 0.8}Fe{sub 0.2})O at room temperature reveals a discontinuity in the bulk modulus at 40 ({+-}5) GPa, similar pressure at which an electronic spin-pairing transition of Fe{sup 2+} is also observed. In the x-ray diffraction experiments the transition is completed only at 80 GPa, possibly reflecting lack of equilibration. Combining recent measurements, we document anomalies in the compression curve of Mg-rich magnesiowuestites that are manifestations of the spin transition. The best fit to a third order Birch-Murnaghan equation for the low-spin phase of magnesiowuestite with 17-20 mol% FeO yields bulk modulus K{sub T0} = 190 ({+-}150) ... continued below

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Speziale, S; Lee, V E; Clark, S M; Lin, J F; Pasternak, M P & Jeanloz, R August 29, 2006.

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High-pressure x-ray diffraction of (Mg{sub 0.8}Fe{sub 0.2})O at room temperature reveals a discontinuity in the bulk modulus at 40 ({+-}5) GPa, similar pressure at which an electronic spin-pairing transition of Fe{sup 2+} is also observed. In the x-ray diffraction experiments the transition is completed only at 80 GPa, possibly reflecting lack of equilibration. Combining recent measurements, we document anomalies in the compression curve of Mg-rich magnesiowuestites that are manifestations of the spin transition. The best fit to a third order Birch-Murnaghan equation for the low-spin phase of magnesiowuestite with 17-20 mol% FeO yields bulk modulus K{sub T0} = 190 ({+-}150) GPa, pressure derivative ({partial_derivative}K{sub T}/{partial_derivative}){sub T0} = 4.6 ({+-}2.7) and unit-cell volume V{sub 0} = 71 ({+-}5) {angstrom}{sup 3}, consistent with past estimates of the ionic radius of octahedrally-coordinated low-spin Fe{sup 2+} in oxides. A sharp spin transition at lower-mantle depths between 1100 and 1900 km (40-80 GPa) would cause a unit-cell volume decrease ({Delta}{nu}{sub {phi}}) of 3.7 ({+-}0.8) to 2.0 ({+-}0.2) percent and bulk sound velocity increase ({Delta}{nu}{sub {phi}}) of 8.1 ({+-}6-1.7) percent ({nu}{sub {phi}} = {radical}K{sub s}/{rho}). Even in the absence of a visible seismic discontinuity, we expect the Fe-spin transition to imply a correction to current compositional models of the lower mantle, with up to 10 mol percent increase of magnesiowuestite being required to match the seismological data.

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  • Journal Name: Journal of Geophysical Research, vol. 112, n/a, October 31, 2007, B10212; Journal Volume: 112

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  • Report No.: UCRL-JRNL-224498
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 920466
  • Archival Resource Key: ark:/67531/metadc900593

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  • August 29, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 5, 2016, 2:41 p.m.

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Speziale, S; Lee, V E; Clark, S M; Lin, J F; Pasternak, M P & Jeanloz, R. Effects of Fe spin transition on the elasticity of (Mg,Fe)O magnesiow�ustites and implications for the seismological properties of the Earth's lower mantle, article, August 29, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc900593/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.