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Oxygen Chemical Diffusion Coefficient of Uranium Dioxide
Author(s) -
LAY K. W.
Publication year - 1970
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1970.tb12134.x
Subject(s) - diffusion , oxygen , electrical resistivity and conductivity , conductivity , analytical chemistry (journal) , chemistry , hydrogen , effective diffusion coefficient , thermodynamics , materials science , chromatography , medicine , physics , organic chemistry , radiology , magnetic resonance imaging , electrical engineering , engineering
The diffusion of oxygen in UO 2+α was measured between 600° and 1100°C. Samples with initial O/U values 2.08 and 2.04 were reduced in hydrogen; reduction was monitored continuously by electrical conductivity measurements. The relation between total conductivity and average O/U ratio was derived, and the diffusion coefficients were obtained. The validity of the electrical conductivity vs O/U relation was checked by measuring weight loss during reduction. Diffusion‐controlled kinetics were confirmed by oxygen gradient measurements. The oxygen chemical diffusion coefficient is given by D = 0.5 exp ‐ This equation agrees with previously determined values of the oxygen chemical diffusion coefficient of UO 2+α .