Charge transfer in FeOCl intercalation compounds and its pressure dependence: An x-ray spectroscopic study

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.82.165121· OSTI ID:21421465

Jarrige, I ^[1]; Cai, Y Q ^[2]; Shieh, S R ^[3]; Ishii, H; Hiraoka, N ^[4]; Karna, S; Li, W -H ^[5]

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1. Japan Atomic Energy Agency, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5148 (Japan)
2. National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
3. Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7 (Canada)
4. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China)
5. Department of Physics, National Central University, Jhongli 32001, Taiwan (China)

We present a study of charge transfer in Na-intercalated FeOCl and polyaniline-intercalated FeOCl using high-resolution x-ray absorption spectroscopy and resonant x-ray emission spectroscopy at the Fe K edge. By comparing the experimental data with ab initio simulations, we are able to unambiguously distinguish the spectral changes which appear due to intercalation into those of electronic origin and those of structural origin. For both systems, we find that about 25% of the Fe sites are reduced to Fe{sup 2+} via charge transfer between FeOCl and the intercalate. This is about twice as large as the Fe{sup 2+} fraction reported in studies using Moessbauer spectroscopy. This discrepancy is ascribed to the fact that the charge transfer occurs on the same time scale as the Moessbauer effect itself. Our result suggests that every intercalated atom or molecule is involved in the charge-transfer process, thus making this process a prerequisite for intercalation. The Fe{sup 2+} fraction is found to increase with pressure for polyaniline-FeOCl, hinting at an enhancement of the conductivity in the FeOCl intercalation compounds under pressure.

• OSTI ID: 21421465
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 82, Issue 16; Other Information: DOI: 10.1103/PhysRevB.82.165121; (c) 2010 The American Physical Society; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
ATOMS
CHARGE TRANSPORT
CLATHRATES
ELECTRIC CONDUCTIVITY
EMISSION SPECTROSCOPY
IRON COMPOUNDS
IRON IONS
MOESSBAUER EFFECT
MOLECULES
OXYCHLORIDES
PRESSURE DEPENDENCE
RESOLUTION
SIMULATION
SODIUM ADDITIONS
X RADIATION
X-RAY SPECTROSCOPY
ALLOYS
CHARGED PARTICLES
CHLORINE COMPOUNDS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
HALOGEN COMPOUNDS
IONIZING RADIATIONS
IONS
OXYGEN COMPOUNDS
OXYHALIDES
PHYSICAL PROPERTIES
RADIATIONS
SODIUM ALLOYS
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS