Abstract
The uranium nitride chloride (UNCl) was prepared from U 2N 3 and UCl 3. The dissolution of UNCl, UN, U 2N 3 and U 3O 8 in LiCl–KCl eutectic melt was studied. The nitrides were studied for the effects of unreacted residues in preparing UNCl; U 3O 8 for the effect of impurity oxygen. The apparent solubility of UNCl in LiCl–KCl melt was extremely low, ∼7×10 −3 wt% U at 773 K, but those of nitrides were even lower. Also the EMF of the cell UN(s)|UNCl, LiCl–KCl|LiCl–KCl, Ag +|Ag was measured. At 773K, the EMF was −1.024 V with a Ag/AgCl ( x=0.091) reference electrode at the saturation of UNCl. These data as well as thermochemical consideration preclude significant decomposition of UNCl in LiCl–KCl eutectic melt.
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