Accession Number:

ADA106115

Title:

Diffusion of 57Co Along Grain Boundaries in NiO,

Descriptive Note:

Corporate Author:

ATOMIC ENERGY RESEARCH ESTABLISHMENT HARWELL (ENGLAND)

Personal Author(s):

• Atkinson,A.
• Taylor,R. I.

Report Date:

1981-06-01

Pagination or Media Count:

18.0

Abstract:

The characteristic parameter alpha D gamma, which is the product of the segregation coefficient, the boundary diffusion coefficient and the boundary width, has been measured for the diffusion of 57Co along both high-angle and low-angle grain boundaries in high purity polycrystalline NiO. The measurements were made at an oxygen pressure of 1 atm. at temperatures in the range 500-800 C, and at an oxygen pressure of 10 to the -11 atm. at 700 C. The results show that the close similarity between the diffusion of Co and Ni in the NiO lattice is also true of the diffusion of Co and Ni along NiO grain boundaries. Author

Descriptors:

• *ANNEALING
• *CRYSTAL LATTICES
• *DIFFUSION
• *GRAIN BOUNDARIES
• *NICKEL COMPOUNDS
• HIGH RATE
• COMPARISON
• OXYGEN
• PURITY
• OXIDES
• SEGREGATION(METALLURGY)
• COEFFICIENTS
• PRESSURE
• COBALT
• POLYCRYSTALLINE
• LOW ANGLES

Subject Categories:

• Physical Chemistry
• Crystallography
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE