The phase equilibrium diagram for the CuI + CsI system has been redetermined by differential scanning calorimetry and X-ray diffraction. The phase diagram exhibits three intermediate compoundsCs3Cu2I5, melting incongruently at 663.0 K, CsCu2I3, melting congruently at 656.0 K, and CsCu9I10, undergoing a solid-state disproportionation reaction to CuI + CsCu2I3 at 604.8 K. The existence of CsCu9I10, derived from DSC studies in accordance with the phase rule, is not shown by X-ray diffraction investigations.

Electrical Conductivity of Molten Cobalt Dibromide + Potassium Bromide Mixtures. -The electrical conductivity of molten CoBr2 is reported for the first time. It shows a high value of activation energy, decreasing on addition of KBr. In the system CoBr2 + KBr, a significant drop of conductivity occurs at a CoBr2 mole fraction of x = 0.333, indicating the formation of the complex ion in the liquid mixture. -(WOJAKOWSKA*, A.; PLINSKA, S.; JOSIAK, J.; KRZYZAK, E.; J.

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