Equilibrium potentials of gold in molten NaCl-KCl-CsCl eutectic

Equilibrium potentials of gold are measured at 500-700°C in a molten ternary NaCl-KCl-CsCl eutectic containing 0.04-2.0 mol % of gold. The temperature dependence of equilibrium potentials is linear, and the equilibrium potential shifts in the negative direction as the temperature increases. The average valence of gold ions in equilibrium with the metal determined from the slope of the equilibrium potential isotherms is 0.92 ± 0.06. The change in the Gibbs energy at the formation of gold monochloride from the elements in the melt is calculated. The conclusion is reached that gold monochloride interacts with the NaCl-KCl-CsCl melt. The reason for the appearence of positive slopes of the equilibrium potential polytherms are analyzed