Abstract
The effect of oxygen impurity on the typical characteristics of UN and (U, Pu)N fuels was investigated. The oxygen content of the samples was adjusted to ∼0.3, ∼0.6 and ∼1.0 wt%. It was confirmed from chemical, X-ray and ceramographic analyses that oxygen added to the nitrides existed in the oxide precipitates after sintering. While sinterability was observed. Furthermore, the addition of ∼1.0wt% of oxygen impurity decreased the thermal conductivities of UN and (U, Pu)N by 9–10 and 12–13% at 1000 and 1500 K, respectively.
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