Abstract
Molar volumes and surface tensions of molten LaCl3-KCl mixtures were measured by dilatometry and the maxim um bubble pressure method, respectively. The molar volume isotherms were found to deviate positively from additivity over the whole composition range, with the maxim um deviation at ca. 30 mol% LaCl3. At the same concentration the isotherms of surface tension at temperatures below 950 °C show a minimum . Surface energy of mixing per unit area calculated from the surface tensions shows a large negative excess at the corresponding composition. These observations are related to the existence o f LaCl6 3- in the KCl-rich melt.
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