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

  • Igor S. Lyubutin , Jung-Fu Lin , Alexander G. Gavriliuk EMAIL logo , Anna A. Mironovich , Anna G. Ivanova , Vladimir V. Roddatis and Alexander L. Vasiliev
Published/Copyright: March 7, 2015
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American Mineralogist
From the journal American Mineralogist Volume 98 Issue 10

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
Received: 2012-11-10
Accepted: 2013-6-9
Published Online: 2015-3-7
Published in Print: 2013-10-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2013.4400
Keywords for this article
Ringwoodite (Mg,Fe)2SiO4; high pressure; spin crossover; Mössbauer spectroscopy

Articles in the same Issue

  1. Review article. The crystal structure and vibrational spectroscopy of jarosite and alunite minerals
  2. Versatile monazite: Resolving geological records and solving challenges in materials science. Petrogenesis of the Kulyk Lake monazite-apatite-Fe(Ti)-oxide occurrence revealed using in-situ LA-(MC)-ICP-MS trace element mapping, U-Pb dating, and Sm-Nd isotope systematics on monazite
  3. Amorphous Materials: Properties, structure, and durability. Analysis of H2O in silicate glass using attenuated total reflectance (ATR) micro-FTIR spectroscopy
  4. Unlocking the secrets of Al-tobermorite in Roman seawater concrete
  5. The determination of hydrogen positions in superhydrous phase B
  6. Carlfrancisite: Mn3 2+(Mn2+,Mg,Fe3+,Al)42(As3+O3)2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42, a new arseno-silicate mineral from the Kombat mine, Otavi Valley, Namibia
  7. Petrology and geochemistry of lunar granite 12032,366-19 and implications for lunar granite petrogenesis
  8. Extreme fractionation from zircon to hafnon in the Koktokay No. 1 granitic pegmatite, Altai, northwestern China
  9. Controls of P-T path and element mobility on the formation of corundum pseudomorphs in Paleoproterozoic high-pressure anorthosite from Sittampundi, Tamil Nadu, India
  10. Aluminum speeds up the hydrothermal alteration of olivine
  11. Iron pairs in beryl: New insights from electron paramagnetic resonance, synchrotron X-ray absorption spectroscopy, and ab initio calculations
  12. Effects of fluid and melt density and structure on high-pressure and high-temperature experimental studies of hydrogen isotope partitioning between coexisting melt and aqueous fluid
  13. DFT simulation of the occurrences and correlation of gold and arsenic in pyrite
  14. Crystal structure and hydration/dehydration behavior of Na2Mg(SO4)2·16H2O: A new hydrate phase observed under Mars-relevant conditions
  15. The diffusion behavior of hydrogen in plagioclase feldspar at 800–1000 °C: Implications for re-equilibration of hydroxyl in volcanic phenocrysts
  16. Quantification of dissolved CO2 in silicate glasses using micro-Raman spectroscopy
  17. Spin transition of Fe2+ in ringwoodite (Mg,Fe)SiO4 at high pressures
  18. P-V-T relations of γ-Ca3(PO4)2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus
  19. Bonding and electronic changes in rhodochrosite at high pressure
  20. Growth of calcium carbonate in the presence of Se(VI) in silica hydrogel
  21. Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements
  22. Far-infrared spectra of synthetic dioctahedral muscovite and muscovite–tobelite series micas: Characterization and assignment of the interlayer I–Oinner and I–Oouter stretching bands
  23. Phosphorus partitioning between olivine and melt: An experimental study in the system Mg2SiO4-Ca2Al2Si2O9-NaAlSi3O8-Mg3(PO4)2
  24. Olivine from spinel peridotite xenoliths: Hydroxyl incorporation and mineral composition
  25. Determination of the melting temperature of kaolinite by means of the Z-method
  26. Darrellhenryite, Na(LiAl2)Al6(BO3)3Si6O18(OH)3O, a new mineral from the tourmaline supergroup
  27. Nizamoffite, Mn2+Zn2(PO4)2(H2O)4, the Mn analogue of hopeite from the Palermo No. 1 pegmatite, North Groton, New Hampshire
  28. Mcalpineite from the Gambatesa mine, Italy, and redefinition of the species
  29. Rossiantonite, Al3(PO4)(SO4)2(OH)2(H2O)10·4H2O, a new hydrated aluminum phosphatesulfate mineral from Chimanta massif, Venezuela: Description and crystal structure
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  32. Erratum
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