Published February 27, 2004
| Version v1
Journal article
Pressure induced self-oxidation of Fe(OH)2
- 1. MST-10, MS-K764, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- 2. School of Physics and Astronomy, Tel Aviv University, 69978, Tel Aviv (Israel)
- 3. Department of Geology and Geophysics, University of California, Berkeley, California 94720 (United States)
Description
Moessbauer spectroscopy, x-ray diffraction, and electrical resistance [R(P,T)] studies in Fe(OH)2 to 40 GPa revealed an unforeseen process by which a gradual Fe2+ oxidation takes place, starting at ∼8 GPa reaching 70% Fe3+ abundance at 40 GPa. The nonreversible process Fe2+→Fe3++e- occurs with no structural transition. The 'ejected' electrons form a deep band within the high-pressure electronic manifold becoming weakly localized at P>50 GPa. This process is attributed to an effective ionization potential created by the pressure induced orientationally deformed (OH) dipoles and the unusual small binding energy of the valence electron in Fe2+(OH)2
Additional details
Identifiers
Publishing Information
- Journal Title
- Physical Review Letters
- Journal Volume
- 92
- Journal Issue
- 8
- Journal Page Range
- p. 085506-085506.4
- ISSN
- 0031-9007
- CODEN
- PRLTAO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 36020879
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- ABUNDANCE; BINDING ENERGY; DIPOLES; ELECTRIC CONDUCTIVITY; ELECTRONS; IONIZATION POTENTIAL; IRON HYDROXIDES; IRON IONS; MOESSBAUER EFFECT; OXIDATION; PRESSURE RANGE GIGA PA; VALENCE; X-RAY DIFFRACTION
- Descriptors DEC
- CHARGED PARTICLES; CHEMICAL REACTIONS; COHERENT SCATTERING; DIFFRACTION; ELECTRICAL PROPERTIES; ELEMENTARY PARTICLES; ENERGY; FERMIONS; HYDROGEN COMPOUNDS; HYDROXIDES; IONS; IRON COMPOUNDS; LEPTONS; MULTIPOLES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PRESSURE RANGE; SCATTERING; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Notes
- (c) 2004 The American Physical Society