Surface Tension of KF–KCl–KI Melts

The surface tension of the KF–KCl–KI salt melts with an unchanged KF/KCl molar ratio is measured as a function of the KI content using a platinum cylinder detachment method. The measurements are performed in an inert atmosphere using structural materials stable against the melts under study. The surface tension of the (66KF–34KCl)–KI (mol %) melts with KI/(KCl + KF) molar ratios of 0–100% is measured in a temperature range of 863–1083 K. KI added to the KF–KCl melt is found to decrease the surface tension. The temperature dependences of the surface tension of the melts are described by linear functions. An increase in the KI concentration is shown to decrease the coefficient of the temperature dependence of the surface tension.