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Enthalpy of Mixing of Melts in the KF—K2TiF6 System

I. Nerád, L. Kosa, E. Mikšíková, and K. Adamkovičová

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava


Abstract: Relative enthalpies of melts in the system KF-K2TiF6 at mole fractions of K2TiF6 equal to 0.25, 0.50, 0.75, and 1.0 have been determined from drop calorimetry measurements at the temperature 1198 K. The enthalpies of mixing and excess entropies of mixing have been calculated from experimental data. The ∆mixH has been found to be negative in the whole composition range of the system. The exothermic effect at mixing reaches minimum of -4.9 kJ mol-1 at the composition around x(K2TiF6) = 0.52. The course of ∆mixH curve indicates the tendency to association of the particles in the melt, producing more complex structural units.

Full paper in Portable Document Format: 531a3.pdf


Chemical Papers 53 (1) 3–5 (1999)

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