Abstract
Measurements have been made between 1800 and 2260°C of the diffusion coefficient D of 59Fe tracer in coarse polycrystalline near-stoichiometric UC. The results give very large values for D, around 5 × 10−8 cm2/s, comparable with the C diffusion rate and 105 to 106 times greater than the self-diffusion of the U in the same temperature range. The enhancement of the U-self-diffusion rate by the presence of Fe, previously observed by Matzke, is much too small to be compatible, on the basis of a vacancy mechanism, with the very large Fe diffusion rates we report here. Accordingly it is proposed that Fe may dissolve, at least partially, in interstitial solution and diffuse by a Miller-type interstitial-vacancy pair mechanism. The likely similar behaviour of other solutes is also briefly discussed.
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