XAFS Spectra and the Oxidation State of Nickel in Some of its Oxycompounds

Abstract

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; Ni302(OH)4 and commercial 'nickel peroxide' (Ni02) likewise contain trivalent nickel. The edge shift for quadrivalent nickel in KNilO6 is reported for the first time.

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Document Details

Document Type
Technical Report
Publication Date
Jun 28, 1994
Accession Number
ADA281137

Entities

People

  • Azzam N. Mansour
  • C. A. Melendres
  • M. Pankuch
  • R. A. Brizzolara

Organizations

  • Naval Ordnance Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Chemical Synthesis
  • Chemistry
  • Contracts
  • Diffraction
  • Electric Vehicles
  • Electron Energy
  • Fermi Levels
  • Materials
  • Materials Science
  • Military Research
  • Nickel Compounds
  • Spectra
  • Spectroscopy
  • Transitions
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.