Home Letter. In situ observation of the breakdown of magnetite (Fe3O4) to Fe4O5 and hematite at high pressures and temperatures
Article
Licensed
Unlicensed Requires Authentication

Letter. In situ observation of the breakdown of magnetite (Fe3O4) to Fe4O5 and hematite at high pressures and temperatures

  • Alan B. Woodland EMAIL logo , Daniel J. Frost , Dmytro M. Trots , Kevin Klimm and Mohamed Mezouar
Published/Copyright: April 2, 2015
Become an author with De Gruyter Brill
Author Information
American Mineralogist
From the journal American Mineralogist Volume 97 Issue 10

Abstract

In situ synchrotron X-ray powder diffraction measurements using a Paris-Edinburgh pressure cell were performed to investigate the nature of the high-pressure breakdown reaction of magnetite (Fe3O4). Refinement of diffraction patterns reveals that magnetite breaks down via a disproportionation reaction to Fe4O5 and hematite (Fe2O3) rather than undergoing an isochemical phase transition. This result, combined with literature data indicates (1) that this reaction occurs at ~9.5-11 GPa and 973-1673 K, and (2) these two phases should recombine at yet higher pressures to produce an h-Fe3O4 phase.

Keywords : Fe4O5; magnetite; phase transformation; high pressure
Received: 2012-6-20
Accepted: 2012-7-17
Published Online: 2015-4-2
Published in Print: 2012-10-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. MSA Roebling medal lecture. Mineralogy, petrology, U-Pb geochronology, and geologic evolution of the Dabie-Sulu classic ultrahigh-pressure metamorphic terrane, East-Central China
  2. Brittle-ductile microfabrics in naturally deformed zircon: Deformation mechanisms and consequences for U-Pb dating
  3. In situ hot-stage AFM study of the dissolution of the barite (001) surface in water at 30–55 °C
  4. A multi-domain gem-grade Brazilian apatite
  5. High-temperature structural behaviors of anhydrous wadsleyite and forsterite
  6. Rates and mechanism of Y, REE, and Cr diffusion in garnet
  7. EPR discrimination of microcrystalline calcite geomaterials
  8. Crystal chemistry of Bi- and Mn-bearing vesuvianite from Långban, Sweden
  9. Cation ordering in Pb2+-bearing, Mn3+-rich pargasite from Långban, Sweden
  10. Long-term solid-phase fate of co-precipitated U(VI)-Fe(III) following biological iron reduction by Thermoanaerobacter
  11. The sulfur speciation in S-bearing minerals: New constraints by a combination of electron microprobe analysis and DFT calculations with special reference to sodalite-group minerals
  12. Simultaneous sound velocity and density measurements of NaCl at high temperatures and pressures: Application as a primary pressure standard
  13. The temperature and compositional dependence of disordering in Fe-bearing dolomites
  14. Quantifying crystallization and devitrification of rhyolites by means of X-ray diffraction and electron microprobe analysis
  15. Reactions of strontium anorthite with H2O+CaCl2 fluids at 500 °C and high pressure: Kinetic information from in situ synchrotron-radiation XRF analyses of the fluid
  16. Solubility of xenotime in a 2 M HCl aqueous fluid from 1.2 to 2.6 GPa and 300 to 500 °C
  17. Elastic and anelastic anomalies due to spin-state transitions in orthorhombic perovskite from isoelectronic behavior of Co3+ and Fe2+
  18. Accurate determination of ferric iron in garnets by bulk Mössbauer spectroscopy and synchrotron micro-XANES
  19. Re-investigation of the crystal structure of enstatite under high-pressure conditions
  20. Second-order P6̄c2-P31c transition and structural crystallography of the cyclosilicate benitoite, BaTiSi3O9, at high pressure
  21. High-pressure structural studies of eskolaite by means of single-crystal X-ray diffraction
  22. Almandine: Lattice and non-lattice heat capacity behavior and standard thermodynamic properties
  23. Witzkeite: A new rare nitrate-sulphate mineral from a guano deposit at Punta de Lobos, Chile
  24. Krasheninnikovite, KNa2CaMg(SO4)3F, a new mineral from the Tolbachik volcano, Kamchatka, Russia
  25. Crystal structure of pseudojohannite, with a revised formula, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12
  26. Letter. A natural photoelectrochemical cell for water splitting: Implications for early Earth and Mars
  27. Letter. In situ observation of the breakdown of magnetite (Fe3O4) to Fe4O5 and hematite at high pressures and temperatures
  28. Letter. The crystal structure of bartelkeite, with a revised chemical formula, PbFeGeVI(Ge2IVO7) (OH)2·H2O, isotypic with high-pressure P21/m lawsonite
https://doi.org/10.2138/am.2012.4270
Keywords for this article
Fe4O5; magnetite; phase transformation; high pressure

Articles in the same Issue

  1. MSA Roebling medal lecture. Mineralogy, petrology, U-Pb geochronology, and geologic evolution of the Dabie-Sulu classic ultrahigh-pressure metamorphic terrane, East-Central China
  2. Brittle-ductile microfabrics in naturally deformed zircon: Deformation mechanisms and consequences for U-Pb dating
  3. In situ hot-stage AFM study of the dissolution of the barite (001) surface in water at 30–55 °C
  4. A multi-domain gem-grade Brazilian apatite
  5. High-temperature structural behaviors of anhydrous wadsleyite and forsterite
  6. Rates and mechanism of Y, REE, and Cr diffusion in garnet
  7. EPR discrimination of microcrystalline calcite geomaterials
  8. Crystal chemistry of Bi- and Mn-bearing vesuvianite from Långban, Sweden
  9. Cation ordering in Pb2+-bearing, Mn3+-rich pargasite from Långban, Sweden
  10. Long-term solid-phase fate of co-precipitated U(VI)-Fe(III) following biological iron reduction by Thermoanaerobacter
  11. The sulfur speciation in S-bearing minerals: New constraints by a combination of electron microprobe analysis and DFT calculations with special reference to sodalite-group minerals
  12. Simultaneous sound velocity and density measurements of NaCl at high temperatures and pressures: Application as a primary pressure standard
  13. The temperature and compositional dependence of disordering in Fe-bearing dolomites
  14. Quantifying crystallization and devitrification of rhyolites by means of X-ray diffraction and electron microprobe analysis
  15. Reactions of strontium anorthite with H2O+CaCl2 fluids at 500 °C and high pressure: Kinetic information from in situ synchrotron-radiation XRF analyses of the fluid
  16. Solubility of xenotime in a 2 M HCl aqueous fluid from 1.2 to 2.6 GPa and 300 to 500 °C
  17. Elastic and anelastic anomalies due to spin-state transitions in orthorhombic perovskite from isoelectronic behavior of Co3+ and Fe2+
  18. Accurate determination of ferric iron in garnets by bulk Mössbauer spectroscopy and synchrotron micro-XANES
  19. Re-investigation of the crystal structure of enstatite under high-pressure conditions
  20. Second-order P6̄c2-P31c transition and structural crystallography of the cyclosilicate benitoite, BaTiSi3O9, at high pressure
  21. High-pressure structural studies of eskolaite by means of single-crystal X-ray diffraction
  22. Almandine: Lattice and non-lattice heat capacity behavior and standard thermodynamic properties
  23. Witzkeite: A new rare nitrate-sulphate mineral from a guano deposit at Punta de Lobos, Chile
  24. Krasheninnikovite, KNa2CaMg(SO4)3F, a new mineral from the Tolbachik volcano, Kamchatka, Russia
  25. Crystal structure of pseudojohannite, with a revised formula, Cu3(OH)2[(UO2)4O4(SO4)2](H2O)12
  26. Letter. A natural photoelectrochemical cell for water splitting: Implications for early Earth and Mars
  27. Letter. In situ observation of the breakdown of magnetite (Fe3O4) to Fe4O5 and hematite at high pressures and temperatures
  28. Letter. The crystal structure of bartelkeite, with a revised chemical formula, PbFeGeVI(Ge2IVO7) (OH)2·H2O, isotypic with high-pressure P21/m lawsonite
Sign up now to receive a 20% welcome discount
Institutional Access
How does access work?
Have an idea on how to improve our website?
Please write us.
© 2025 De Gruyter Brill
Downloaded on 23.10.2025 from https://www.degruyterbrill.com/document/doi/10.2138/am.2012.4270/html
Scroll to top button