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Hyperfine Interactions

, Volume 57, Issue 1–4, pp 2119–2125 | Cite as

Chemical state of cobalt doped in and adsorbed on α-(Fe1-xCr x )2O3 by emission Mössbauer spectroscopy

  • Toshihide Tsuji
  • Keiji Naito
Surface Phenomena, Catalysis, Corrosion
  • 19 Downloads

Abstract

Mössbauer parameters (internal magnetic field, quadrupole splitting and isomer shift) of both α-(Fe1-xCr x )2O3 (x=0, 0.2 and ≈1.0) doped and undoped with57Co are in good agreement at room temperature and 77 K, except internal magnetic fields of both α-Cr2O3 doped with57Co and enriched57Fe. It is thus concluded that57Fe produced from57Co occupies the octahedral sites as Fe3+ with small distortion from cubic symmetry. Different internal magnetic field of doped α-Cr2O3 may be explained by the difference of canting of the spin against the [111] axis.

By adding zinc ions, the adsorption of Co2+ ions on α-Fe2O3 particles in aqueous solution is decreased considerably in the pH range of 6.5–9.5 at 303 K, but the internal magnetic field of57Co adsorbed on α-Fe2O3 does not change, although the internal magnetic fields of both samples with and without zinc ions are smaller than that of bulk α-Fe2O3 doped with57Co. This suggests that densities of57Co ions on the surface of α-Fe2O3 may be decreased by the addition of zinc ions and57Co ions adsorbed on α-Fe2O3 are weakly bound on the substrate.

Keywords

Spectroscopy Zinc Magnetic Field Thin Film Aqueous Solution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1990

Authors and Affiliations

  • Toshihide Tsuji
    • 1
  • Keiji Naito
    • 1
  1. 1.Department of Nuclear Engineering, Faculty of EngineeringNagoya UniversityNagoyaJapan

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