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Structural complexity of simple Fe<sub>2</sub>O<sub>3</sub> at high pressures and temperatures [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 10,661 : digital, PDF file
Additional Creators
Argonne National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Although chemically very simple, Fe2O3 is known to undergo a series of enigmatic structural, electronic and magnetic transformations at high pressures and high temperatures. So far, these transformations have neither been correctly described nor understood because of the lack of structural data. Here we report a systematic investigation of the behaviour of Fe2O3 at pressures over 100 GPa and temperatures above 2,500 K employing single crystal X-ray diffraction and synchrotron Mössbauer source spectroscopy. Crystal chemical analysis of structures presented here and known Fe(II, III) oxides shows their fundamental relationships and that they can be described by the homologous series nFeO·mFe2O3. Decomposition of Fe2O3 and Fe3O4 observed at pressures above 60 GPa and temperatures of 2,000 K leads to crystallization of unusual Fe5O7 and Fe25O32 phases with release of oxygen. Lastly, our findings suggest that mixed-valence iron oxides may play a significant role in oxygen cycling between earth reservoirs.
Report Numbers
E 1.99:1238292
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Note
Published through SciTech Connect.
02/11/2016.
Nature Communications 7 02, 2016 ISSN 2041-1723 AM
Elena Bykova; L. Dubrovinsky; N. Dubrovinskaia; M. Bykov; C. McCammon; S. V. Ovsyannikov; H. -P. Liermann; I. Kupenko; A. I. Chumakov; R. Ruffer; M. Hanfland; V. Prakapenka.
View MARC record | catkey: 24045033