Accession Number:

ADA281137

Title:

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

Descriptive Note:

Technical rept.

Corporate Author:

NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD

Personal Author(s):

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

Report Date:

1994-06-28

Pagination or Media Count:

15.0

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 Ni302OH4 and commercial nickel peroxide Ni02 likewise contain trivalent nickel. The edge shift for quadrivalent nickel in KNilO6 is reported for the first time.

Descriptors:

• *X RAY DIFFRACTION
• *SPECTRA
• *OXIDATION
• *NICKEL
• *ABSORPTION
• SPECTROSCOPY
• EDGES
• BATTERY COMPONENTS
• PATTERNS
• VALENCE
• ELECTROCHEMISTRY
• TIME
• ENERGY
• STRUCTURES

Subject Categories:

• Inorganic Chemistry
• Physical Chemistry
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE