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These decomposition rates will be of prime interest in operating the newer homogeneous reactors he fuel for homogeneous research reactors is enriched uranium present as uranyl sulfate in an ordinary (light)

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The electrical conductivities of solutions of the series La, Ce, Pr, and Nd in their molten triiodides are similar to those of the corresponding chloride systems, and thus likewise reflect the gradual increase in stability of the dipositive ion M2+. For example, in solutions containing 15 mole % metal, the specific electronic contribution Kgoin -«salt decreases from 22 and 25 ohm-1 cm.-1 for La and Ce, respectively, to 4 for Pr and ~0 for Nd. The positive temperature dependence of the conductivity in the concentration range where electronic contribution is sizable indicates that there is thermal excitation of electrons from the solute. The phase equilibrium diagrams near the MI3 and ML compositions are discussed in terms of the solute species. The MI3 liquidus data are compatible with the postulated M2+ solute or its dissociation into M3 + and anion-like electrons. The metallic character of the molten diiodides, which are metal-like (M3+(I~)ze") in the solid state, appears to decrease in the melt in the order La > Ce > Pr.