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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

Online
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1945-3027
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Volume 98, Issue 10

Issues

Spin transition of Fe2+ in ringwoodite (Mg,Fe)SiO4 at high pressures

Igor S. Lyubutin / Jung-Fu Lin
  • Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712-0254, U.S.A.
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/ Alexander G. Gavriliuk
  • Corresponding author
  • Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow 119333, Russia
  • Institute for Nuclear Research, Russian Academy of Sciences, 60-letiya Oktyabrya prospekt 7a, Moscow 117312, Russia
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/ Anna A. Mironovich
  • Institute for Nuclear Research, Russian Academy of Sciences, 60-letiya Oktyabrya prospekt 7a, Moscow 117312, Russia
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/ Anna G. Ivanova / Vladimir V. Roddatis / Alexander L. Vasiliev
  • Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow 119333, Russia
  • National Scientific Center, “Kurchatov Institute,” Moscow 123098, Russia
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Published Online: 2015-03-07 | DOI: https://doi.org/10.2138/am.2013.4400

Abstract

Electronic spin transitions of iron in the Earth’s mantle minerals are of great interest to deep-Earth researchers because their effects on the physical and chemical properties of mantle minerals can significantly affect our understanding of the properties of the deep planet. Here we have studied the electronic spin states of iron in ringwoodite (Mg0.75Fe0.25)2SiO4 using synchrotron Mössbauer spectroscopy in a diamond-anvil cell up to 82 GPa. The starting samples were analyzed extensively using transmission and scanning electron microscopes to investigate nanoscale crystal chemistry and local iron distributions. Analyses of the synchrotron Mössbauer spectra at ambient conditions reveal two non-equivalent iron species, (Fe2+)1 and (Fe2+)2, which can be attributed to octahedral and tetrahedral sites in the cubic spinel structure, respectively. High-pressure Mössbauer measurements show the disappearance of the hyperfine quadrupole splitting (QS) of the Fe2+ ions in both sites at approximately 45-70 GPa, indicating an electronic high-spin (HS) to low-spin (LS) transition. The spin transition exhibits a continuous crossover nature over a pressure interval of ~25 GPa, and is reversible under decompression. Our results here provide the first experimental evidence for the occurrence of the spin transition in the spinel-structured ringwoodite, a mantle olivine polymorph, at high pressures.

Keywords : Ringwoodite (Mg,Fe)2SiO4; high pressure; spin crossover; Mössbauer spectroscopy

About the article

Received: 2012-11-10

Accepted: 2013-06-09

Published Online: 2015-03-07

Published in Print: 2013-10-01


Citation Information: American Mineralogist, Volume 98, Issue 10, Pages 1803–1810, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2013.4400.

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© 2015 by Walter de Gruyter Berlin/Boston.

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