Structural complexity of simple Fe2O3 at high pressures and temperatures.

Abstract:

: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. Our findings suggest that mixed-valence iron oxides may play a significant role in oxygen cycling between earth reservoirs.

journal_name

Nat Commun

journal_title

Nature communications

authors

Bykova E,Dubrovinsky L,Dubrovinskaia N,Bykov M,McCammon C,Ovsyannikov SV,Liermann HP,Kupenko I,Chumakov AI,Rüffer R,Hanfland M,Prakapenka V

doi

10.1038/ncomms10661

subject

Has Abstract

pub_date

2016-02-11 00:00:00

pages

10661

issn

2041-1723

pii

ncomms10661

journal_volume

7

pub_type

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