Abstract
From the excess resistivity obtained by quenching from temperatures between 1300 and 1600 °C a formation energy of 1.7 eV is determined. The quenchedin resistivity recovers with an activation energy of 2.2 eV in the temperature region between 400 and 600 °C. These two values are attributed to the formation and migration activation energies of uranium vacancies, respectively. It is further shown that uranium monocarbide remains single-phase, if the deviation from stoichiometry does not exceed more than a few tenths of one percent and if gases (mainly oxygen) are in solid solution.
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