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The high-pressure phase transformation and breakdown of MgFe2O4

  • Sofia Winell EMAIL logo , Hans Annersten and Vitali Prakapenka
Published/Copyright: March 31, 2015
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American Mineralogist
From the journal American Mineralogist Volume 91 Issue 4

Abstract

The high-pressure transformation of MgFe2O4 was studied by Mössbauer and Raman spectroscopy and synchrotron X-ray diffraction using the DAC technique and laser annealing at temperatures of 1500-2000 K. The high-pressure phase of MgFe2O4 was observed from in situ Mössbauer spectra at 17 ± 1 GPa after laser annealing by the appearance of two quadrupole doublets. This indicates a disordered distribution of Mg and Fe in an early stage. The displacive nature of the transformation of the spinel into its high-pressure polymorph was shown at increasing pressure by the redistribution of iron into only one site. After decompression Mössbauer spectroscopy revealed the presence of Fe2O3 in the sample. This was further confirmed by Raman spectroscopy at ambient conditions and by in situ high-pressure XRD, indicating a partial breakdown of the spinel into its constituent oxides MgO and Fe2O3. The XRD pattern of the high-pressure phase of MgFe2O4 can be indexed in agreement with the CaMn2O4-type structure, with cell parameters a = 2.775(2), b = 9.283(16), and c = 9.446(5) Å at 23 ± 2 GPa. The multiphase spectra from all three analytical methods suggests that inhomogeneous conditions prevailed in the DAC experiments, resulting in two different reactions at high pressure and temperature, i.e., T < 1800 K: MgFe2O4 → Fe2O3 + MgO and T > 1800 K: MgFe2O4 → hp-MgFe2O4.

Keywords : High-pressure studies; magnesioferrite; phase transition; Mössbauer spectroscopy; XRD data
Received: 2005-3-22
Accepted: 2005-7-9
Published Online: 2015-3-31
Published in Print: 2006-4-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2006.1946
Keywords for this article
High-pressure studies; magnesioferrite; phase transition; Mössbauer spectroscopy; XRD data

Articles in the same Issue

  1. Structural model for the biogenic Mn oxide produced by Pseudomonas putida
  2. Electron-beam (5–10 keV) damage in triplite-group phosphates: Consequences for electron-microprobe analysis of fluorine
  3. Vacancy defects in MgO at high pressure
  4. Plastic flow of pyrope at mantle pressure and temperature
  5. Parvo-mangano-edenite, parvo-manganotremolite, and the solid solution between Ca and Mn2+ at the M4 site in amphiboles
  6. Reinvestigation of the MgSiO3 perovskite structure at high pressure
  7. The mechanism and kinetics of α-NiS oxidation in the temperature range 670–700°C
  8. Influence of charge location on 29Si NMR chemical shift of 2:1 phyllosilicates
  9. The size distribution of exsolution lamellae in iron-free clinopyroxene
  10. The high-pressure phase transformation and breakdown of MgFe2O4
  11. Elastic behavior, phase transition, and pressure induced structural evolution of analcime
  12. A new chemical etching technique for peridotites using molten anhydrous borax
  13. Poppiite, the V3+ end-member of the pumpellyite group: Description and crystal structure
  14. Cation redistribution in the octahedral sheet during diagenesis of illite-smectites from Jurassic and Cambrian oil source rock shales
  15. A shock-induced polymorph of anatase and rutile from the Chesapeake Bay impact structure, Virginia, U.S.A.
  16. Water in the interlayer region of birnessite: Importance in cation exchange and structural stability
  17. In situ HAFM study of the thermal dehydration on gypsum (010) surfaces
  18. Influence of dehydration kinetics on T-O-T bridge breaking in zeolites with framework type STI: The case of stellerite
  19. Estimation of volume fractions of liquid and vapor phases in fluid inclusions, and definition of inclusion shapes
  20. Thermodynamics of uranyl minerals: Enthalpies of formation of uranyl oxide hydrates
  21. SIMS investigation of electron-beam damage to hydrous, rhyolitic glasses: Implications for melt inclusion analysis
  22. Synthetic Ag-rich tourmaline: Structure and chemistry
  23. Genesis and compositional heterogeneity of smectites. Part III: Alteration of basic pyroclastic rocks—A case study from the Troodos Ophiolite Complex, Cyprus
  24. Ganterite, the barium mica Ba0.5K0.5Al2(Al1.5Si2.5)O10(OH)2, from Oreana, Nevada
  25. Letter. Transformation of pentlandite to violarite under mild hydrothermal conditions
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