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BIBTEX RIS

First study of uranium self-diffusion in UO2 by SIMS

1998; Elsevier BV; Volume: 257; Issue: 2 Linguagem: Inglês

10.1016/s0022-3115(98)00482-6

ISSN

1873-4820

Autores

Antônio Claret Soares Sabioni, Wilmar Barbosa Ferraz, F. Millot,

Tópico(s)

Radioactive contamination and transfer

Resumo

Uranium self-diffusion coefficients were measured in UO2 single crystals through an original methodology based on the utilization of 235U as tracer and depth profiling by secondary ion mass spectrometry (SIMS). The values of the self-diffusion coefficients measured in this work, between 1498 and 1697°C, in H2 atmosphere, can be described by the following Arrhenius relation: D (cm2/s)=8.54 × 10−7exp[−4.4(eV)/kT], and are lower than those previously determined by other authors in `nearly stochiometric' UO2 in the same temperature range.

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