OXYGEN ION SELF-DIFFUSION IN URANIUM DIOXIDE

Journal Article · Tue Feb 28 23:00:00 EST 1961 · J. Nuclear Materials

DOI:https://doi.org/10.1016/0022-3115(61)90194-5· OSTI ID:4043837

Auskern, A B; Belle, J

By means of the isotopic exchange reaction between uranium dioxide powders of normal O/sup 10/ content and carbon dioxide gas enriched in O/sup 18/, the self-diffusion of oxygen in stoichiometric and non-stoichiometric uranium dioxide is measured. For essentially stoichiometric U0/sub 2/, diffusion (D) of oxygen in the temperature range 550 to 780 deg C can be represented by the equation D = 1.2 x 10/sup 3/ exp (-65 300/ RT). In nonstoichiometric UO/sub 2/, oxygen diffusion rates are increased, and the activation energy is decreased by more than half. The diffusion current carriers are considered to be oxygen ions in interstitial positions. An interstitialcy mechanism for diffusion is suggested. (auth)

• Research Organization: Westinghouse Electric Corp., Pittsburgh
• NSA Number: NSA-15-024013
• OSTI ID: 4043837
• Journal Information: J. Nuclear Materials, Journal Name: J. Nuclear Materials Vol. Vol: 3
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CARBON DIOXIDE
CARRIERS
DEFECTS
DIFFUSION
ENRICHMENT
EQUATIONS
HIGH TEMPERATURE
INTERSTITIALS
IONS
LATTICES
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
OXYGEN
OXYGEN 18
POWDERS
REACTION KINETICS
TEMPERATURE
THERMODYNAMICS
URANIUM DIOXIDE