Enthalpy of mixing of melts in the KF-K2TiF6 system

Relative enthalpies of melts in the system KF-K2TiF6 at mole fractions of K 2TiF6 equal to 0.25, 0.50, 0.75, and 1.0 have been determined from drop cal orimetry measurements at the temperature 1198 K. The enthalpies of mixing a nd excess entropies of mixing have been calculated from experimental data. The Delta(mix)H has been found to be negative in the whole composition rang e 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 Delta(mi x)H curve indicates the tendency to association of the particles in the mel t, producing more complex structural units.