XAFS Spectra and the Oxidation State of Nickel in Some of its Oxycompounds
NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD
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XANES spectra of nickel K-edge and X-ray diffraction patterns of several nickel oxycompounds were measured. The shift in energy of the Ni K- absorption edge towards higher values correlates well with the increase in the oxidation state of nickel from 2 to 4 in the compounds studied. The inflection point energy of the Ni pre-edge structure shifts approximately 1 eV per unit change in valency. Our results provide evidence which supports the assignment that the valency of Ni in Beta-NiOOH is 3 Ni302OH4 and commercial nickel peroxide Ni02 likewise contain trivalent nickel. The edge shift for quadrivalent nickel in KNilO6 is reported for the first time.
- Inorganic Chemistry
- Physical Chemistry
- Atomic and Molecular Physics and Spectroscopy