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American Mineralogist

Journal of Earth and Planetary Materials

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


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

Online
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1945-3027
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Volume 97, Issue 10

Issues

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

Alan B. Woodland
  • Corresponding author
  • Institut für Geowissenschaften, Universität Frankfurt, Altenhöferallee 1, 60438 Frankfurt, Germany
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Daniel J. Frost / Dmytro M. Trots / Kevin Klimm
  • Institut für Geowissenschaften, Universität Frankfurt, Altenhöferallee 1, 60438 Frankfurt, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Mohamed Mezouar
Published Online: 2015-04-02 | DOI: https://doi.org/10.2138/am.2012.4270

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

About the article

Received: 2012-06-20

Accepted: 2012-07-17

Published Online: 2015-04-02

Published in Print: 2012-10-01


Citation Information: American Mineralogist, Volume 97, Issue 10, Pages 1808–1811, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2012.4270.

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