Liquidus Temperature and Electrical Conductivity of Molten Eutectic CsCl-NaCl-KCl Containing ReCl4

The liquidus temperatures and electrical conductivity of the (CsCl-NaCl-KCl)eut-ReCl4 melts, feasible for Re production, were studied by thermal analysis and impedance spectroscopy. A part of the quasi-binary phase diagram for [CsCl-KCl-NaCl]eut-ReCl4 in the ReCl4 concertation range of 0–7.61 mol % was compiled on the basis of obtained thermal analysis data. ReCl4 is most likely to dissolve in molten eutectic CsCl-KCl-NaCl with the formation of the ReCl62– ions. Compound Cs2ReCl6 was identified in the frozen samples by XRD analysis. The electrical conductivity of molten mixture (CsCl-KCl-NaCl)eut.-ReCl4, measured in the cell with the coaxial glassy carbon electrodes, was found to decrease with increasing ReCl4 content.