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Stability and nature of the volume collapse of ε-Fe2O3 under extreme conditions

Author

Listed:
  • J. A. Sans

    (Universitat Politècnica de València)

  • V. Monteseguro

    (European Radiation Synchrotron Facility
    Universitat de València)

  • G. Garbarino

    (European Radiation Synchrotron Facility)

  • M. Gich

    (Institut de Ciència de Materials de Barcelona (ICMAB-CSIC))

  • V. Cerantola

    (European Radiation Synchrotron Facility)

  • V. Cuartero

    (European Radiation Synchrotron Facility
    Centro Universitario de la Defensa de Zaragoza)

  • M. Monte

    (European Radiation Synchrotron Facility)

  • T. Irifune

    (Ehime University, 2–5 Bunkyo-cho
    Earth-Life Science Institute, Tokyo Institute of Technology)

  • A. Muñoz

    (MALTA Consolider Team, Universidad de La Laguna)

  • C. Popescu

    (ALBA-CELLS)

Abstract

Iron oxides are among the major constituents of the deep Earth’s interior. Among them, the epsilon phase of Fe2O3 is one of the less studied polymorphs and there is a lack of information about its structural, electronic and magnetic transformations at extreme conditions. Here we report the precise determination of its equation of state and a deep analysis of the evolution of the polyhedral units under compression, thanks to the agreement between our experiments and ab-initio simulations. Our results indicate that this material, with remarkable magnetic properties, is stable at pressures up to 27 GPa. Above 27 GPa, a volume collapse has been observed and ascribed to a change of the local environment of the tetrahedrally coordinated iron towards an octahedral coordination, finding evidence for a different iron oxide polymorph.

Suggested Citation

  • J. A. Sans & V. Monteseguro & G. Garbarino & M. Gich & V. Cerantola & V. Cuartero & M. Monte & T. Irifune & A. Muñoz & C. Popescu, 2018. "Stability and nature of the volume collapse of ε-Fe2O3 under extreme conditions," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-06966-9
    DOI: 10.1038/s41467-018-06966-9
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