The Equilibrium between Titanium Ions and Metallic Titanium in the Molten Binary Mixtures of LiCl

The equilibrium constant, Kc, of the reaction 3Ti2+ = 2Ti3+ + Ti was studied in the molten binary mixtures of LiCl. The accurate values of Kc were calculated by the best-fitting method under consideration of the TiOCl(s) dissolution at temperature of 973 K, 1023 K and 1073 K, respectively. The fitted concentration of O2− was verified by emf method with yttria-stabilized zirconia electrode (YSZE). The influence of the cation radius of electrolyte on the equilibrium constant was studied in molten binary mixtures of LiCl at 1023 K on the basis of the reliable method for obtaining accurate value of Kc. It was found that the Kc values decreased from 0.59 to 0.27 with the concentration of LiCl increasing at 1023 K. More importantly, results disclosed that the values of Kc correspond with polarizing power no matter in CsCl-LiCl or KCl-LiCl system.