Electrochemical Behavior of Chromium Difluoride in Molten Lithium and Beryllium Fluoride Mixtures

Abstract

The interaction between CrF2 and a molten binary LiF-BeF2 mixture has been studied using the electrochemical methods. The polarization of the chromium electrode relative to the dynamic beryllium electrode was measured. The obtained voltammetry data elucidates that under the experimental conditions, chromium is observed exclusively in one valence form. According to the cathode polarization dependences, it is established that the reduction of chromium ions in the metal occurs by a two-electron electrode reaction. The equilibrium concentrations of chromium were experimentally measured at the temperatures of 923, 973, and 1023 K at different chromium fluoride concentrations in the melt. The oxidation degree of chromium, dissolved in the melt, was calculated according to the concentration dependences of the equilibrium potentials. A thermodynamic analysis of the chromium difluoride dissolution in a molten mixture of lithium and beryllium fluorides was performed. The formation of dilute solutions of chromium difluoride is accompanied by slight deviations of the salt system from Raoult's laws.

Interaction Between Uranium Trifluoride and the Mixture of Lithium and Beryllium Fluorides

“…1) is described in detail elsewhere. 37,38 Table III presents the results of the performed measurements. Average arithmetic values of the galvanic element EMF (Eq.…”

“…There is a vast literature data on the measurements of the kind using Li/Li+ and Са/Са2 + dynamic reference electrodes to study the processes in chloride melts, 33,34 as well as К/К + and Ве/Ве 2+ reference electrodes are used to analyze fluoride salts. 28,29,[35][36][37][38] Figure 3 presents a schematic of the electrochemical cell that was used for EMF measurements of the galvanic element.…”