| Autor: |
Murch, G. E., Bradhurst, D. H., De Bruin, H. J. |
| Zdroj: |
Philosophical Magazine; December 1975, Vol. 32 Issue: 6 p1141-1150, 10p |
| Abstrakt: |
Oxygen self-diffusion coefficients in UO2+x were obtained using the nuclear reactions 18O(p, n)18F and 17O(d, n)18F followed by autoradiography. The activation energy for migration and the pre-exponential were 23·1 ± 3·8 kcal mole-1 and 6·25 ± 5·03 × 10-4 cm2 sec-1, respectively, at x≃0·08. The functional dependence of the oxygen self-diffusion on composition could be semiquantitatively explained on the basis of a cooperative diffusion mechanism via a Willis 2 : 2 : 2 defect cluster subject to a very short-range defect-defect interaction. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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